6th week 36.-42. day
Developement of the puppy:
This is the end of the period of slow body growth of the fetuses. The growth is more intense. The ossification of bones, backbone and fingers continues. At this time almost all the bodily organs are present. Eyes are closed and first hair appear on the head. Pigmentation appears. We can hear heartbeat of the fetuses with a stetoscope. The size of the fetus is about 30 % of the weight at birth.
How the bitch changes:
The bitch is starting to gain weight. The uterus is enlarged, we can also see slight enlargement of the milk glands, the nipples are darker and bigger. We are feeding slightly more, four times a day in small portions.