The Fourth Trimester: What the First 12 Weeks Are Like

What the idea means

The first three months after a baby arrives are a stage of their own. The baby is adjusting to life outside the womb, and the parents are recovering, learning and changing too. Thinking of it as a "fourth trimester" can help you plan for it and go easier on yourselves. It applies to adoptive, foster and non-birthing parents as well.

What the baby needs

• Closeness. Being held, carried, rocked and talked to is what newborns are built for. You can't spoil a baby this young.
• Frequent feeds: often 8-12 times in 24 hours, with cluster feeding in the evenings.
• Sleep in short bits: 14-17 hours a day, no real pattern at first. Always on the back, in their own flat, firm space.
• Help calming: swaddling for young babies who aren't rolling, shushing, gentle swaying, a pacifier, skin-to-skin, a walk outside.
• Crying often peaks around 6-8 weeks and eases by 3-4 months. See the colic and crying guide.

What the parents are going through

• Physical recovery from birth, which takes longer than the 6 weeks people expect (see the postpartum recovery guide).
• Big hormone and identity shifts. Many parents feel both deep love and grief for their old life. Both are normal.
• Sleep loss, a changed relationship and a new daily rhythm.

A rough map

• Weeks 1-2: survival mode. Feeding, healing, diapers, the first checkups. Keep visitors few and helpful.
• Weeks 3-6: feeding often feels easier, crying ramps up, first smiles appear. The adrenaline wears off and tiredness sets in.
• Weeks 7-12: longer awake times, cooing, more predictable stretches. Many parents start feeling more like themselves, and some go back to work.

Plan it like you'd plan a birth

• Decide who covers nights, meals, older kids, pets and errands.
• Make a short list of jobs visitors can do.
• Line up your people: a lactation consultant, a postpartum doula if you can, a pediatrician, and one friend you can text at 2 am.
• Many cultures set aside a rest period of about 40 days after birth, with family cooking, keeping house and caring for the new parent. Borrow what fits your family.

Protect a few basics

• One longer sleep stretch for each adult when possible (see the sleep for new parents guide).
• Food and water within reach of wherever you feed.
• Ten minutes outside most days.
• A daily check-in with a partner or support person.

When to check in

• The birthing parent should hear from their own provider within 3 weeks and have a full visit by 12 weeks (see the postpartum checkups guide). The baby's checkups run alongside.
• Mention low mood, worry or not coping that lasts beyond 2 weeks at any of these visits.
• If a baby under 3 months has a rectal temperature of 100.4°F (38°C) or higher, or anyone has trouble breathing, call the pediatrician or 911 right away.