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Pregnancy Week by Week List
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Weekly milestones for baby and mother-to-be
First Trimester
- You're actually not pregnant yet—the clock starts ticking from the first day of your last period.Week 11
- You'll ovulate, and if egg meets sperm, you'll be on your way to pregnancy!2
Week 2 - Your baby is a tiny ball – called a blastocyst – made up of several hundred cells that are multiplying quickly.3
Week 3 - Your fertilized egg, known as a zygote, is a ball of 32 cells that's about the size of a poppy seed.4
Week 4 - The ball of cells now resembles a tadpole and is as big as a peppercorn.5
Week 5 - Your baby's nose, mouth, and ears are beginning to take shape. You may be having morning sickness and spotting.6
Week 6 - Your baby is now about the size of a small blueberry.7
Week 7 - Her arm buds, which formed last week, now look like paddles.8
Week 7 - Your baby is already developing amazingly distinct facial features.9
Week 7 - As your pregnancy hormones increase, morning sickness may be worsening. Or, you may be ravenous 24/7.Week 710
- Baby's developing a permanent set of kidneys.Week 711
- Baby's arm and leg joints are now forming.Week 712
- Your baby is about the size of a raspberry.13
Week 8 - His delicate facial features are becoming more refined, with his ears, upper lip, and the teeny tip of his nose all clearly visible.14
Week 8 - His eyelids will also take shape for the first time this weekWeek 815
- Your baby is constantly moving, though you can't feel it.Week 816
- Your doctor may look or listen for the baby's heartbeat with an ultrasound.Week 817
- Your baby has graduated from embryo to fetus—and is now about the size of a cherry18
Week 9 - The digestive tract and reproductive organs are formed19
Week 9 - Reproductive organs are beginning to form now, along with some other key organs, like the pancreas and gallbladder.Week 920
- Your baby is about the size of a kumquat and can stretch his spine.21
Week 10 - Her eyes and eyelids are more developed and her eyebrows are beginning to grow.22
Week 10 - Baby has working arm joints, and cartilage and bones are forming.23
Week 10 - Baby's vital organs are fully developed and they're starting to function.Week 1024
- Baby's fingernails and hair are starting to appear too.Week 1025
- You may have aches and pains in your abdomen, as baby's putting a pressure on your organs, veins, muscles and ligaments.Week 1026
- Your baby is as big as a lime27
Week 11 - Baby's fingers and toes aren't webbed anymore.28
Week 11 - Tooth buds, hair follicles and nail beds are forming.Week 1129
- The fetus will start to inhale and exhale small amounts of amniotic fluid, which helps your baby's lungs to grow and develop.Week 1130
First Trimester
- You're actually not pregnant yet—the clock starts ticking from the first day of your last period.1
- You'll ovulate, and if egg meets sperm, you'll be on your way to pregnancy!2
- Your baby is a tiny ball – called a blastocyst – made up of several hundred cells that are multiplying quickly.3
- Your fertilized egg, known as a zygote, is a ball of 32 cells that's about the size of a poppy seed.4
- The ball of cells now resembles a tadpole and is as big as a peppercorn.5
- Your baby's nose, mouth, and ears are beginning to take shape. You may be having morning sickness and spotting.6
- Your baby is now about the size of a small blueberry.7
- Her arm buds, which formed last week, now look like paddles.8
- Your baby is already developing amazingly distinct facial features.9
- As your pregnancy hormones increase, morning sickness may be worsening. Or, you may be ravenous 24/7.10
- Baby's developing a permanent set of kidneys.11
- Baby's arm and leg joints are now forming.12
- Your baby is about the size of a raspberry.13
- His delicate facial features are becoming more refined, with his ears, upper lip, and the teeny tip of his nose all clearly visible.14
- His eyelids will also take shape for the first time this week15
- Your baby is constantly moving, though you can't feel it.16
- Your doctor may look or listen for the baby's heartbeat with an ultrasound.17
- Your baby has graduated from embryo to fetus—and is now about the size of a cherry18
- The digestive tract and reproductive organs are formed19
- Reproductive organs are beginning to form now, along with some other key organs, like the pancreas and gallbladder.20
- Your baby is about the size of a kumquat and can stretch his spine.21
- Her eyes and eyelids are more developed and her eyebrows are beginning to grow.22
- Baby has working arm joints, and cartilage and bones are forming.23
- Baby's vital organs are fully developed and they're starting to function.24
- Baby's fingernails and hair are starting to appear too.25
- You may have aches and pains in your abdomen, as baby's putting a pressure on your organs, veins, muscles and ligaments.26
- Your baby is as big as a lime27
- Baby's fingers and toes aren't webbed anymore.28
- Tooth buds, hair follicles and nail beds are forming.29
- The fetus will start to inhale and exhale small amounts of amniotic fluid, which helps your baby's lungs to grow and develop.30
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