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Pregnancy

When the embryo is 18 days old, the kitten got his nutrients through the placenta.

When the embryo is 22 days old, the development of the head, eyes and the legs is starting.

At the age of 28 days, the foetus is about 2.5 cm long and the intestines are formed

Between 40 and 45, the bones are formed

The foetus will develop very quickly the last 3 weeks before the birth.
Kitten who were born before day 58 don't survive.
Kittens who were born after day 70 awill be bigger then normal.