Your baby moves through different stages, starting as a blastocyst, then maturing into an embryo, and then a fetus. Around the five week mark, your baby’s heart will begin to beat, at 27 weeks they’ll have regular sleep and wake cycles, and at 39 weeks your baby is physically developed.<\/p>\n
\nYour baby is an embryo consisting of two layers of cells from which all her organs and body parts will develop. 4 weeks pregnant. 5 weeks pregnant. 6 weeks pregnant. 7 weeks pregnant.\n<\/p>\n
Baby’s Development at 20 Weeks. At 20 weeks, the developing fetus is about 6 inches long (13.2 cm) and may weigh about 10 ounces. The baby may begin to make movements that the mother can feel at about 19 to 21 weeks; this baby movement is termed “quickening”. The baby at this stage of development can move its facial muscles, yawn, …<\/p>\n","protected":false},"excerpt":{"rendered":"