Part Two: The fourth trimester

Months 0 to 3 · Weeks 1 to 13 · Days 1 to 91

The first three months are often called the fourth trimester, because your baby is still adjusting to life outside the womb and wants much of what they had there: warmth, closeness, movement, your heartbeat and food on demand. You are adjusting too, healing from birth and learning a new person. Over these weeks your baby grows from about 50 cm (20 in) and 3.3 kg (7 lb 4 oz) to roughly 60 cm (24 in) and 6 kg (13 lb), starts to smile and coo, and slowly finds a rhythm. The nights are hard, and they do get easier.