In the week 20 your son is fourth months and a half old. He is 25 cm long from head to toes and weighs approximately 280 grams.
The uterus has increased in size and puts pressure on the abdomen wall and the lungs.
By Neus Ferrando Gilabert BSc, MSc (embryologist) and Sandra Fernández BA, MA (fertility counselor).
Last Update: 11/13/2014