Experiments in mice show that undernourished mothers produce offspring that undergo a premature surge of leptin, which is causally linked to later obesity in the offspring.

In other motherhood news...
Question: What do you do if you're 16 years old, five months pregnant, but you're worried that having twins will mess up your college and social plans, and your mother, sister and sister-in-law have advised you to get an abortion?
Answer: Convince your boyfriend to step on your stomach. Be advised that this method may terminate both the pregnancy and your relationship, since the boyfriend got a life sentence for two counts of murder.