The most critical period of its development is between three and seven weeks after fertilization, when a simple heart tube assumes the shape of a four-chambered heart. In fact, the heart actually begins beating by the 22nd day of life.
When you are 5 weeks pregnant, your baby's heart is made up of two tiny channels called heart tubes and they're already hard at work, beating to their own drummer (it will be weeks before those beats become coordinated).
I just had my first OB appointment at 7 weeks and there was only a gestational sac and yolk sac, no fetal pole :(.... My doctor thinks I had a missed miscarriage but I've not had any bleeding so I'm still hopeful that my baby is okay. Has anyone else experienced this?
If you break embryonic and fetal development into thirds then when you are in your 28th week the baby begins its final third of development. (Gestation is 266 days or 38 weeks of development). So either way you look at it you are in your 3rd trimester!
Could a diopter change from 20/600 to 20/950 in both eyes within a time span of two years be caused by cataracts at age 55?
However, the mass now cannot be seen on ultrasound at 28 weeks yet another cause for concern has arisen. During my 25 week ultrasound it was noted that the female fetal head was lagging behind in growth (about the 8th percentile) while the rest of her body was growing normally. Now at 28 weeks her head is still behind in growth (one measurment three weeks behind and the other four) while her body is measuring normal for 28 weeks!
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