Prenatal and Newborn Development

By: Krista Sherick

First Trimester

Weeks 1-12
  • In your first week of pregnancy your baby is called a Zygote. A one celled organism. Your little baby Zygote duplicates and replicates and forms a bundle of cells called a blastocyst.
  • One third of the way through your first trimester your blastocyst has developed into an embryo. At this point your baby has all of it's DNA make-up-hair and eye color, complexion, sex and other characteristics.
  • Your baby's internal organs develop and your baby's heart begins to beat.
  • At the end of the first 12 weeks your baby is about the size of your pinky finger.

Second Trimester

Weeks 13-27
  • Your baby can hiccup and suck its thumb. Your baby can also see some light through your belly and can hear moms heartbeat.
  • You will feel your baby move inside of you during the second trimester.
  • You will be able to see the sex of your baby through an ultrasound.
  • Your baby can feel mom moving around.

Third Trimester

Weeks 28-40
  • Your baby is getting used to it's lungs by inhaling and exhaling amniotic fluid.
  • Your baby is continuing to put on weight. Your baby will gain approximately 4 to 7 pounds. Activity is higher than ever.
  • Your baby has fully grown fingers and toes, with nails and all.
  • Your baby will position itself upside down to prepare for delivery.

Taking Care of your Unborn Baby

  • Visit a doctor for prenatal care and to have them check medications that you take.
  • Eat healthy foods. Your baby gets all of it's nourishment from what mom eats. Take prenatal vitamins. Some birth defects can be caused by diet. Lack of folic acid during the early stages of pregnancy show a direct link to spina bifida.
  • Do not drink, smoke or use drugs while pregnant. This causes serious birth defects and mental illness in newborns.