Pregnancy, week by week
What's happening, what's ahead, and one small memory to keep, every week from 1 to 40.
First trimester
1 week pregnantPregnancy dating begins with the first day of your last menstrual period. Conception usually has not happened 2 weeks pregnantYour body may be preparing to release an egg. Although you are not technically pregnant yet, these days can be3 weeks pregnantA tiny beginning may be underway. If egg and sperm meet, the fertilized egg begins dividing as it travels towa4 weeks pregnantImplantation may be happening, and your body may begin producing the hormone detected by pregnancy tests. You 5 weeks pregnantYour baby is still incredibly tiny, but the foundations of the brain, spinal cord and heart are beginning to f6 weeks pregnantSmall beginnings are taking shape: early facial features and limb buds are starting to appear. Your body may b7 weeks pregnantYour baby’s brain is growing quickly, and early arms, legs, and facial features are becoming more defined. Foo8 weeks pregnantTiny fingers and toes are beginning to take shape. Your baby is moving, even though those movements are far to9 weeks pregnantYour baby is becoming more recognizable, with developing eyelids, fingers and toes. Inside, every day brings r10 weeks pregnantYour baby has entered the fetal stage, an exciting milestone in development. Many of the structures formed dur11 weeks pregnantYour baby may stretch and move in ways you cannot yet feel. Tiny fingers and toes are now separated, and the b12 weeks pregnantYou are nearing the end of the first trimester. Your baby’s reflexes and movements are becoming more coordinat13 weeks pregnantOne trimester is nearly behind you. Your baby is moving more deliberately and may even bring a hand toward the
Second trimester
14 weeks pregnantYour baby’s face is becoming more expressive, and the neck and body are lengthening. You may notice a little m15 weeks pregnantYour baby is practicing small movements while bones continue to strengthen. The outside world is still quiet, 16 weeks pregnantYour baby can move arms and legs with increasing coordination. You may soon feel the first tiny flutters, an e17 weeks pregnantSoft fat is beginning to form beneath your baby’s skin, while the umbilical cord continues to provide nourishm18 weeks pregnantYour baby may be stretching, rolling and responding to sounds inside your body. Those first fluttering movemen19 weeks pregnantA protective coating called vernix is beginning to form over your baby’s skin. Movements may be becoming easie20 weeks pregnantYou are halfway to 40 weeks, an exciting milestone. Your baby is swallowing, moving, and practicing skills tha21 weeks pregnantYour baby's movements may be becoming part of your daily rhythm. Eyebrows and eyelids are formed, and swallowi22 weeks pregnantYour baby's senses are becoming more active, and familiar sounds may begin filtering into their world. Your gr23 weeks pregnantYour voice and heartbeat are becoming familiar parts of your baby's environment. Their movements may feel more24 weeks pregnantYour baby is growing steadily, and their face is nearly fully formed. Sleep-and-wake patterns may be emerging,25 weeks pregnantYour baby may respond to a loud sound or your changing position. Their movements are getting stronger as muscl26 weeks pregnantYour baby may open their eyes for the first time and react to changes in light. Movement patterns are becoming27 weeks pregnantYour baby's brain is developing rapidly, and their movements may now be strong enough for someone else to feel
Third trimester
28 weeks pregnantWelcome to the third trimester. Your baby can blink, move vigorously, and practice breathing movements while c29 weeks pregnantYour baby is gaining strength and may have recognizable active and quiet periods. Your own sleep may be interr30 weeks pregnantYour baby’s brain is developing rapidly, while fat continues to build beneath the skin. Tiny hiccups may feel 31 weeks pregnantYour baby is taking up more room, so movements may feel more like rolls and stretches than quick flips. Every 32 weeks pregnantYour baby is practicing breathing, swallowing and coordinated movements. Fingernails and toenails continue gro33 weeks pregnantYour baby is receiving antibodies through the placenta and building reserves for life after birth. Their bones34 weeks pregnantYour baby is continuing to gain weight and store protective fat beneath the skin. The lungs and nervous system35 weeks pregnantYour baby is focusing on growth and finishing touches before birth. You may feel heavier, slower, or increasin36 weeks pregnantYour baby may be settling lower into your pelvis, although this can happen later. Breathing may feel a little 37 weeks pregnantYou have reached early term. Your baby is still benefiting from each day of brain, lung and body development. 38 weeks pregnantYour baby's organs are preparing for life outside the uterus, while the brain and lungs continue fine-tuning. 39 weeks pregnantYou are now full term. Your baby continues building brain connections and storing fat while you wait for the f40 weeks pregnantYour due week is here, but it remains an estimate rather than a deadline. Your baby continues moving, growing,
General, educational information, not medical advice. If something worries you, check with your provider or pediatrician.
Meet our founder
Brittany Ryan
Founder and Mom of Two
Brittany is a mom of two with a background in early childhood development. Little by Little Together began with a beautiful, blank baby book. Like so many parents, she bought baby books with every intention of filling them; instead, they sat in a closet while life kept moving. So she built a personal assistant for parenthood that tells you what matters right now, offers one simple idea at a time, and keeps your story safe.
“You don’t have to remember everything at once. Little by little, there is a story worth keeping.”