Breastfeeding: A Behind The Scenes Look

If you’re pregnant or newly a mum, you’ve probably heard breastfeeding described as “natural” and “instinctive”, as if it should all just click into place. For a lot of women it doesn’t feel that way at first. There’s a real learning curve for both you and your baby, and it helps to actually understand what’s going on in your body and why things sometimes feel wobbly before they feel easy. This is a proper look at the mechanics of breastfeeding: how milk is made, what’s actually in it, how to get a comfortable latch, and what to do when things don’t go smoothly.

How Your Body Actually Makes Milk

Milk production starts changing well before your baby arrives. From around the second trimester, your breasts begin producing colostrum, the thick, yellowish first milk that’s packed with antibodies and concentrated nutrition. Your baby will get this in the first few days after birth, usually in small amounts, because that’s exactly what a newborn’s tiny stomach needs.

Around day three to five, your milk “comes in” and shifts to what’s called transitional milk, then settles into mature milk over the following couple of weeks. This is when a lot of women notice their breasts feel fuller or heavier. That’s normal, but it can also tip into uncomfortable engorgement if feeds are spaced too far apart, so frequent feeding in these early days genuinely matters.

Milk moves from the milk-producing glands (alveoli) through a network of ducts down to the nipple. The key thing to understand is that milk supply works on a demand basis: the more effectively and often milk is removed from the breast, the more your body is signalled to produce. This is why frequent feeding or pumping in the early weeks helps build a good supply, and why long gaps between feeds, especially in the first fortnight, can sometimes slow things down.

The Hormones Doing the Work

• Prolactin: released after your baby feeds, this hormone tells your breasts to make more milk. Levels are highest at night, which is one reason night feeds matter so much for building supply.
• Oxytocin: this triggers the “let-down”, the reflex that pushes milk through the ducts towards your baby. Some women feel a tingling or slight cramping sensation when this happens, others feel nothing at all. Both are completely normal. Stress, pain or anxiety can temporarily dampen the let-down reflex, which is one reason a calm, comfortable feeding setup can genuinely help, especially in the early weeks.

What’s Actually in Breast Milk, and Why It Matters

Breast milk isn’t a fixed recipe. Its composition changes from the start of a feed to the end, across the day, and over the weeks and months as your baby grows. It contains antibodies from your own immune system, along with proteins, fats, and living cells that formula simply can’t replicate.

Research consistently links breastfeeding with a lower risk of certain infections, including ear infections and some respiratory illnesses, particularly in the first six months. It’s also associated with a reduced risk of eczema and, in some studies, lower rates of childhood obesity and type 2 diabetes later in life. Some research also points to a reduced risk of Sudden Infant Death Syndrome, though safe sleep practices (a firm flat mattress, no loose bedding, baby on their back) matter just as much and shouldn’t be seen as optional even if you’re breastfeeding.

It’s worth saying clearly: these are population-level associations, not guarantees for any individual baby, and formula-fed babies grow up perfectly healthy too. If you’re combination feeding or using formula for any reason, your baby can still thrive. If you have specific concerns about your baby’s health or growth, that’s a conversation for your health visitor, midwife or GP rather than something to work out from an article.

What Breastfeeding Does for You

The benefits aren’t only for the baby. Breastfeeding releases oxytocin in you too, which can help you feel calmer and supports bonding. It also helps your uterus contract back down after birth, which is part of why some women notice cramping (sometimes called afterpains) while feeding in the first week or two.

Practically speaking, it’s also free and always available, no bottles to sterilise at 3am. Some studies suggest breastfeeding is linked to a slightly lower risk of breast and ovarian cancer later in life for the mother, though this shouldn’t be the main reason anyone decides to breastfeed. It’s one factor among many, and your own health and wellbeing during this period matters just as much as your baby’s.

Getting a Good Latch

A comfortable latch makes an enormous difference to how breastfeeding feels, day to day. Signs your baby is latched well:

• Their mouth is wide open with lips flanged outwards, not tucked in, and they take in a good mouthful of breast tissue, not just the nipple.
• Their chin touches your breast, and their nose is usually clear or just lightly touching.
• You feel a strong pulling sensation rather than sharp pain. Some tenderness in the first few days is common, but ongoing pain, pinching, or cracked and bleeding nipples usually mean the latch needs adjusting.
• You can hear or see rhythmic swallowing once your milk is flowing.

If feeding is consistently painful, don’t just push through it and assume it will pass. It’s one of the most common reasons breastfeeding gets abandoned early, and it’s very often fixable with help from a midwife, health visitor or a lactation consultant.

Positions Worth Trying

Different positions suit different bodies, babies and situations, so it’s worth trying a few rather than sticking with whatever you happened to start with.

• Cradle hold: baby lies along your forearm, tummy to tummy with you. A classic starting point once you and your baby have got the hang of latching.
• Cross-cradle hold: you support your baby’s head and neck with the opposite hand to the breast you’re feeding from, giving you more control over the latch. Often easier for newborns or anyone still finding their feet with positioning.
• Side-lying position: you and your baby lie facing each other. Useful for night feeds, after a caesarean, or whenever you want to feed lying down, though it’s worth being cautious about drifting off with baby in the bed unless you’ve followed safe co-sleeping guidance from your health visitor.
• Football (or clutch) hold: baby is tucked under your arm at your side rather than across your body. Handy after a caesarean since it keeps weight off your abdomen, and often used for feeding twins or babies who need extra support with latching.

Whichever position you use, bring your baby to the breast rather than leaning yourself down towards them. That small adjustment prevents a lot of neck and back strain during long feeding sessions.

Common Bumps in the Road

Cluster feeding, where your baby wants to feed almost constantly for a few hours (often in the evening), is normal and usually happens around growth spurts. It’s exhausting, but it’s not a sign your milk supply is failing.

Engorgement (hard, painful, overly full breasts) usually settles once a good feeding rhythm is established, and can be eased with warm compresses before feeds and cool compresses afterwards. Blocked ducts feel like a tender lump and often respond to gentle massage and continued feeding on that side. Mastitis is different: it usually comes with a red, hot, painful area on the breast plus flu-like symptoms such as fever, chills or feeling generally unwell. If you think you have mastitis, contact your GP or midwife promptly, as it sometimes needs antibiotics.

Low supply is often assumed but less common than people think. Signs your baby is genuinely getting enough include steady weight gain (checked by your health visitor), regular wet and dirty nappies, and settled behaviour after most feeds. If you’re worried, get your baby weighed rather than guessing.

When to Ask for Help

There’s no prize for struggling on alone. A midwife, health visitor, breastfeeding drop-in group or lactation consultant can watch a feed in person and spot things you can’t see or feel yourself, like a subtle latch issue or tongue-tie. If breastfeeding is painful, your baby isn’t gaining weight as expected, or you’re feeling overwhelmed, reach out sooner rather than later. Most problems in the early weeks are genuinely fixable with the right support.

Wherever You’re At

Breastfeeding can be straightforward for some and a real slog for others, sometimes both at different points with the same baby. Understanding what’s happening physically, the hormones, the supply and demand system, the latch, tends to make the whole process feel less mysterious and a bit less daunting. Whether you breastfeed exclusively, combination feed, or use formula, what matters most is that your baby is fed and you’re supported through it. Watch the short animation below for a visual walkthrough of how milk production and let-down actually work.