If your baby was born in week 27 of pregnancy, he or she would have a 90 percent chance of surviving. He or she would also look similar to a baby born at 40 weeks, albeit a lot smaller and thinner. This period of pregnancy from 27 weeks onward is known as within the period of fetal viability.

Keep in mind, though, that there is still a lot of development that will occur during the next 13 weeks. Also, a premature baby born during this week of pregnancy will be in for a long hospital stay. A baby born this premature will probably not be able to breathe on his or her own, cannot maintain a consistent body temperature, and cannot protect him or herself against infections.

When you’re 27 weeks pregnant, your baby measures about 9.6 inches crown to rump, and weighs a little more than 2 pounds.

When you are 27 weeks pregnant, your baby’s brain embarks on a period of rapid growth. The forebrain grows to cover the rest of the brain, resulting in some important brain development.

During week 27 of pregnancy, your baby’s muscle coordination will allow him or her to start thumb sucking. This activity calms the baby and strengthens cheek and jaw muscles for nursing.

Other fetal development that is occurring when you are 27 weeks pregnant includes the following:

  • The network of nerves to the ear is completed
  • The baby takes some breaths, and although breathing in water, not air, it is good practice for the lungs
  • Eyelids begin to open, and the retinas begin to form
  • Your baby may be able to recognize your voice and your partner’s voice.

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