9 weeks

The sac in which the baby is developing is the size of a hen's egg - and inside is the baby, three centimetres long. (5cm by the end of the week!)

You may notice a slight thickening of your waistline - maybe you find you can't quite fasten the top button of your jeans. Don't blame it on the baby yet - the baby only weighs four grams, or maybe an eighth of an ounce. It's probably fluid retention.

The baby has most of the internal organs though they may not be in their final place, and they are all very under developed. Eyes and ears develop rapidly at this time, and the beginnings of the skeleton are present.


In week 9 -7 weeks after conception- the fingers are clearly visible.