Feeding the First Year: Nutrition from Pregnancy Through Weaning

This is Part 1 of our Nutrition Through the Ages series. Part 2: Children and Teens | Part 3: Adults and Ageing

The first thousand days, from conception to a child's second birthday, shape health outcomes for decades. What a mother eats during pregnancy affects fetal development. What a baby eats in the first year establishes the gut microbiome, influences taste preferences, and lays down the nutritional foundations that the body will build on for life.

This is not about pressure or perfection. It is about understanding what matters most at each stage, so you can focus your energy where it counts.

Pregnancy: feeding two systems, not two people

We covered pregnancy nutrition in detail in our pregnancy food safety guide, so here is the summary of what matters most.

You are not eating for two in terms of calories. Energy requirements do not increase in the first two trimesters and rise by only about 200 calories in the third. But your requirements for specific nutrients increase substantially: folate for neural tube development, iron for expanded blood volume, calcium for fetal skeleton building, omega-3 DHA for brain and eye development, and vitamin D for calcium absorption.

The practical version: take folic acid (400mcg daily until week 12), eat oily fish twice a week, include iron-rich foods paired with vitamin C, get three calcium servings daily, and supplement vitamin D (10mcg daily year-round).

The foods to avoid are specific and for good reason: soft mould-ripened cheeses, pate, liver, raw shellfish, high-mercury fish, and undercooked meat. Everything else is fair game.

Breastfeeding: your nutritional needs increase, not decrease

Many mothers are surprised to learn that breastfeeding requires more additional energy than pregnancy. The NHS estimates an extra 500 calories per day for exclusively breastfeeding mothers, though this varies significantly between individuals.

Your body is producing roughly 750ml of milk per day by the time your baby is a few months old. That milk draws on your nutritional reserves. If you are not eating enough, your body will deplete its own stores to maintain milk quality, which means your bones, your iron levels, and your energy suffer.

Key nutrients during breastfeeding: calcium (your baby is still building bones from your supply), vitamin D (passes into breast milk and supports both of you), omega-3 DHA (critical for your baby's brain development, transferred through milk), iodine (essential for thyroid function in both mother and baby), and B12 (particularly important if you are vegetarian or vegan, as B12 in breast milk depends directly on maternal intake).

Hydration matters more than at any other time in adult life. You are producing a liquid product. Drink water regularly throughout the day, and keep a glass within reach during feeds.

Weaning: from around six months

The NHS recommends introducing solid foods at around six months, when babies show three signs of readiness: sitting up and holding their head steady, coordinating their eyes and hands to look at food, pick it up, and put it in their mouth, and being able to swallow food rather than pushing it back out with their tongue.

The first foods are about tastes and textures, not calories. Your baby is still getting most of their nutrition from breast milk or formula. Weaning is an introduction, not a replacement.

First foods that work well: Mashed or soft-cooked vegetables (sweet potato, carrot, butternut squash, broccoli, peas). Soft fruit (banana, ripe pear, avocado, mango). Well-cooked egg. Plain full-fat yoghurt. Porridge made with baby's usual milk.

Start with vegetables, not fruit. This is a practical tip backed by paediatric dietitians. Babies are born with a preference for sweet flavours (breast milk is sweet). If you start weaning with fruit, the sweeter taste can make vegetables harder to introduce later. Starting with vegetables for the first few weeks helps establish acceptance of savoury, bitter, and earthy flavours.

Introduce allergens early, one at a time. Current UK guidance (updated from the older advice to delay allergens) recommends introducing common allergens from around six months: well-cooked egg, peanut (as smooth peanut butter, never whole nuts), cow's milk (in cooking or on cereal), wheat, sesame, fish, and tree nuts (as nut butters). Introduce one at a time, in small amounts, so you can identify any reaction.

Iron becomes critical from six months. Babies are born with iron stores that last roughly six months. After that, they need dietary iron. Good sources for babies: red meat (pureed or well-cooked and finely shredded), lentils, chickpeas, fortified baby cereal, egg yolks, and dark leafy greens.

What to avoid before 12 months: Honey (risk of infant botulism), whole nuts (choking hazard, use nut butters instead), salt (baby kidneys cannot handle it), added sugar, cow's milk as a main drink (fine in cooking), low-fat products (babies need full-fat for brain development), and rice drinks (contain arsenic levels too high for babies).

The pouch problem

Baby food pouches are convenient and ubiquitous. But there are legitimate concerns from paediatric dietitians. Many pouches are predominantly fruit-based (even savoury-sounding ones like "sweet potato and apple" are often 70% apple) which skews taste preferences towards sweet. The smooth texture does not help babies learn to chew. And the sucking action from a pouch spout is different from the skills needed for eating from a spoon or self-feeding.

Pouches are fine occasionally. They should not be the foundation of weaning. Where possible, offer real food: mashed, soft, finger-sized pieces that your baby can explore. The mess is part of the development.

How MyFoodFit helps at this stage

The pregnancy profile scores foods against the specific nutrient needs and safety restrictions of pregnancy. Once your baby arrives, the app helps you evaluate the products you are buying for yourself during breastfeeding and, as weaning progresses, assess baby-targeted products for hidden sugars, salt content, and actual nutritional value.

Many baby food products marketed as healthy contain surprising amounts of sugar from fruit concentrates. Scanning them reveals what the colourful packaging obscures.

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This content is for information only and does not replace medical advice. Discuss weaning plans with your health visitor or GP, particularly if your baby was premature or has known allergies.