Healthy weight gain in pregnancy

Weight gain is a normal, necessary and healthy part of pregnancy — your body is growing a baby, a placenta, extra blood and fluid, and some energy stores for breastfeeding. Yet it’s also a source of anxiety for a lot of people, in a culture obsessed with weight. So it helps to have a calm, honest picture of what’s normal and what actually matters.

How much is “normal”? There’s no single right number, because the healthy range depends on your build and your weight before pregnancy — someone who started at a lower weight is generally advised to gain more than someone who started heavier. Rather than fixating on a target, know that your care team will weigh you at appointments and keep a gentle eye on the trend; they’ll only raise it if there’s a reason to. Most of the gain happens in the second and third trimesters, often as a fairly steady climb, and it’s normal for it to be uneven week to week.

Where does it go? It’s reassuring to see that only a portion of the weight is the baby. The rest is the placenta, amniotic fluid, your enlarged uterus and breasts, a big increase in blood and body fluid, and some fat stores your body lays down to fuel pregnancy and breastfeeding. In other words, it’s your body doing exactly what it’s meant to.

“Eating for two” is a myth. You need only a small amount of extra energy, and not until later in pregnancy — roughly a healthy snack’s worth, not a second dinner. So the goal isn’t to eat much more, but to eat well: plenty of variety across the food groups, enough protein, iron and calcium, lots of vegetables and wholegrains, and staying hydrated. Gentle, regular exercise (with your care team’s okay) supports healthy weight gain and your wellbeing too.

A word on the pressure. Pregnancy is not a time to diet or try to lose weight, and it’s not a time to weigh yourself obsessively — both can do more harm than good. If you’re carrying more weight, your team will support you without judgement; if you’re anxious about gaining, that’s worth talking about too. And if you have a history of disordered eating, do mention it to your GP or midwife, as they can make sure you’re properly supported.

If your weight gain is very rapid or very sudden — especially with swelling of your face and hands, a headache or vision changes — mention it promptly, as sudden swelling can be a sign of pre-eclampsia rather than “just” weight.

Otherwise, try to let go of the number and trust the process. Eat well, move gently, and remember that healthy weight gain is a sign your body is nourishing your baby exactly as it should. Your shape will change — that’s the whole point — and your body deserves kindness for the work it’s doing.