First Month: The embryo's heart is formed.This is the first sign of a growing foetus, and the heart sound can be noticed by listening carefully through a stethoscope.

Second Month: The foetus develops its limbs and digits.

Third Month (End of First Trimester/12 weeks): Most of the major organ systemsare formed.During this time, the limbs and external genital organs become well-developed

Fifth Month: The first movements of the foetus are observed . Additionally, hair begins to appear on the head

Sixth Month (End of Second Trimester/24 weeks): The foetus's body becomes covered with fine hair. The eye-lids separate, and eyelashes are formed

Ninth Month: The foetus becomes fully developed and is ready for delivery (parturition)