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Pregnancy Month by Month

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Fourth Month of Pregnancy
3D Ultrasound 17 weeks
Photo © J. Rauch

The placenta has taken over production of the hormones needed to sustain your pregnancy. Your baby is also making some of its own insulin and bile. Your baby even urinates into the amniotic fluid in small amounts every 45 minutes or so.

Your baby’s heart pumps about 25 quarts of blood a day. This will increase to be about 300 quarts by the end of your pregnancy. All of the teeth have formed and you even have a scalp hair pattern!

Your baby is about 3 ounces (85 grams) and 6.3 inches (16 cms). The gender may be detectable by ultrasound. Though gender predictions at this point are much harder to rely on.

Be sure to take someone with you to your doctor or midwife's appointment this month. Having someone go with you when you hear the heartbeat is always a lot of fun. If you can try to record the sound on a device like a phone or a small tape recorder. Listening to these fast little hoofbeats of your baby can help you make it through some of the rough spots of pregnancy between appointments.

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