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First Trimester - Baby Center
After fertilization and implantation, a baby is at first just an embryo: two layers of cells from which all the organs and body parts will develop.
https://www.babycenter.com/pregnancy-growing-baby-weeks-2-13
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13 Weeks Pregnant: Fetal Development - Baby Centre
Your baby is now the length of a pea pod, about 7.4cm (2.9in) from head to bottom (crown to rump). He weighs nearly 23g (0.8oz). His head makes up a third of his body length.
https://www.babycentre.co.uk/13-weeks-pregnant
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1 to 3 Months Pregnant - 1st Trimester Baby Growth and Development
The first three months of your pregnancy are the most critical. WebMD tells you how your baby's growing.
https://www.webmd.com/baby/1to3-months
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First Trimester: From Embryo to Fetus - HowStuffWorks
First Trimester: From Embryo to Fetus - The first trimester is critical because it involves the formation of delicate organs. Learn about the first trimester and facts about miscarriage and chorionic villus sampling.
https://health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/pregnancy2.htm
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The First Trimester Fetal Development Week by Week - YouTube
Week by week development during the first trimester.
https://www.youtube.com/watch?v=hDkX2vzfG1g
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First Trimester Fetal Development: Images of Your Growing Baby
Do you know what to expect in the first trimester of pregnancy? We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb during the first trimester.
http://www.parents.com/pregnancy/stages/fetal-development/first-trimester-images-of-your-developing-baby/
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Fetal Development: First Trimester
Fetal development during the first trimester.
http://americanpregnancy.org/while-pregnant/first-trimester/
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Your First Trimester, Week-by-Week - Fit Pregnancy and Baby
Your First Trimester, Week-by-Week
https://www.fitpregnancy.com/pregnancy/pregnancy-calendar/your-first-trimester-week-week
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Fetal Development: The 1st Trimester - Mayo Clinic
Fetal development begins before you even know you're pregnant. Here's what happens early on.
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/prenatal-care/art-20045302
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Inside pregnancy: Weeks 10 to 14 - Baby Center
Fingerprints and nails are forming, and eyes and ears move into place so your baby can squint and grimace.
https://www.babycenter.com/2_inside-pregnancy-weeks-10-to-14_10308108.bc
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Baby at 9, 10, 11, 12 Weeks Pregnant - Pregnancy Guide - NHS Choices
Find out how a baby or foetus grows and develops when you're 9, 10, 11 and 12 weeks pregnant, plus changes in your body during these pregnancy weeks.
https://www.nhs.uk/conditions/pregnancy-and-baby/pages/pregnancy-weeks-9-10-11-12.aspx
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9 Weeks Pregnant - TheBump
Baby is the size of a cherry at 9 weeks pregnant. Your 9-week fetus measures around .9 inches and weighs about .07 ounces, and his or her growth is picking up steam!
https://www.thebump.com/pregnancy-week-by-week/9-weeks-pregnant
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Fetal Development Weeks 5 Through 8
See what's happening with your baby in the second month!
http://www.parents.com/pregnancy/stages/fetal-development/fetal-growth-weeks-5-8/
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6 Weeks Pregnant: Fetal Development - Baby Centre
Now that you're six weeks pregnant, your baby is about the size of a lentil. Her heart is beginning to separate into four chambers and is now beating about 150 times a minute. That's around twice the rate of your heart.
https://www.babycentre.co.uk/6-weeks-pregnant
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The Inside Story: Your Baby in Weeks 1 Through 4
Your pregnancy has started -- even though you may not know it. Find out what's going on right now during your baby's very first weeks of life in utero.
http://www.parents.com/pregnancy/week-by-week/4/your-baby-in-weeks-1-through-4/
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Fetal Development in the First Trimester: Stages and Timeline - Study
When does the fetal heart start beating or the brain develop? Find out in this lesson covering the first trimester of pre-natal development.
https://study.com/academy/lesson/stages-of-embryogenesis-definition-and-timeline.html
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What Your Baby Looks Like at 6 Weeks - Baby Center
Arms and legs are budding. Your baby already has tiny hands and feet shaped like paddles, with webbing between the developing fingers and toes.
https://www.babycenter.com/fetal-development-images-6-weeks
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Fetal Development Weeks 1 Through 4 - Parents
See what's happening with your baby in the first month!
http://www.parents.com/pregnancy/stages/fetal-development/fetal-growth-weeks-1-4/
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Why First Trimester is Crucial for Baby's Heart Health
The first trimester of pregnancy is a crucial time for a baby's heart health later in life.
https://www.pregnancymagazine.com/pregnancy/pregnancy-health/first-trimester-is-crucial-for-your-babys-heart-health
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First Trimester Fetal Development - Baby+Company Blog
Some of the (amazing!) fetal development goes on while you’re dealing with the side effects of pregnancy.
http://www.babyandcompany.com/first-trimester-fetal-development/
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Fetal Development in the First Trimester - Parent Savvy
The first 12 weeks of your pregnancy is an important time in the development of your baby. Caring for this new life can be both exciting and exhausting!
http://parentsavvy.com/articles-and-blog/575/
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Stages of Fetal Development - First Trimester - Department of Health
Biologically speaking, fertilization (or conception) is the beginning of human development. Fertilization normally occurs within several hours of ovulation (some authors report up to 24 hours) when a man's sperm combines with a woman's egg
inside a woman's uterine tube.
http://new.dhh.louisiana.gov/index.cfm/page/986
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Your Baby’s Development: The First Trimester - Family Doctor
From the moment of conception to the time of delivery, your growing baby goes through several stages of development before he or she is ready to be born. Here’s what happens during the first trimester of pregnancy.
https://familydoctor.org/your-babys-development-the-first-trimester/
