Fetus early 2nd trimester
 Gut no longer herniated

 Dilute urine, metanephros

 Liver produces serum albumin,
  stores glycogen, secretes bile

 Lungs gland like

 Endocrine glands partially
   functional

 Myelination spinal roots and
   cord has begun

 Hiccup, swallow, gasp, yawn

 Gender differences recognizable