a lot of different things can affect development most commonly drugs and alcohol. they say junk food, pop etc but I don't believe it could in moderation. Stress can affect it if your so stressed out your getting panic attacks. And commonly chromosomes are lacking which would cause miscarriage.
Smoking, drinking, cocaine, bad diet
uterus
eighth week
Look at this link below:
The uterus
Smoking, drinking, cocaine, bad diet
products of the maternal immune system disrupt fetal development
The site of fetal development is the uterus. It refers to an organ that is found in the lower body of a woman or a female mammal.
Embryology
uterus
There is no way to sum up fetal development: from conception to development to what problems may occur and when; one paragraph wouldn't even begin to cover it all.
Compare embryonic growth and fetal development in single and multiple pregnancies, including the incidence of complications and infant mortality.
pregnancie
the right and left atrium of the fetal heart.
Pregnancy
cartilaginous
The fetal period.