Your second trimester starts during your fourth month
of pregnancy, beginning on week 14.
The embryo has a CRL of around 3 inches (8 cm).
The biological sex of the fetus can in some cases be
seen by seeing outside sex organs on an ultrasound.
Hair starts to develop.
The prostate organ starts creating in organically male
embryos.
Ovaries descend from the midriff to the pelvic
territory in naturally female babies.
The top of the mouth is framed.