1. FIRST TRIMESTER
• THE INNER CELLS MASS GRADUALLY GIVES RISE TO THE
ORGANS AND TISSUES OF THE EMBRYO the placenta
develops inside the uterus and surrounds the embryo.

2. SECOND
TRIMESTER during weeks 12
-23
• The period of the
second trimester
the fetus weighs
about 0.5kg and
has the face of an
infant.
• There is an
important change
in hormone
secretion by the
placenta

3. THIRD TRIMESTER ~you experience rapid
growth becoming larger and gaining stronger
bones and muscles
also substances from the mothers blood
stream is transferred into the fetus
bloodstream.