Question

What are the major features of embryonic development at various months of pregnancy?

Answer 1

Week 1:Fertilization,cleavage to form blastocyst 4-5 days.Implantation 6-7 days after fertilization.
Week 2:The germ layers(ectoderm,mesoderm and endoderm)develop.
Week 3:Menstrual flow stops.Beginning of formation of backbone,brain and spinal cord.Neural tube develops.Embryo 3mm long.
Week 6:Brain stsrts developing,limbs' buds appear.Embryo about 1.3 cm long.
Week 12:Formation of eyes,ears start.Embryo about 10 cm long.
Week 24:Major organs starts developing,formation of hands,feet start.Foetus about 33 cm.
Week 28:Foetus fully formed.Sex organs get developed.Foetusstarts movements.It grows in size of about 37 cm long.
Week 32:Hairs starts appearing,finger nails and toe nails also appear.Baby 43 cm long.
Week 36:Ready for birth.Size 47 cm.
Week 40:It is birth time.Size 50 cm.