Russian girls are not afraid to give birth early. They know for sure their moms will do the job! Even high-school pregnant teens do not actually worry. If the time for abortion passed, their parents will take care of their early kids. They will not only give money monthly, but sit with a baby daily. A girl can go to the school, to the University in time, dance at the disco and relax. A flat would be taken from an old great-grandmother for a young couple or a single new mom. If there is no free flat in the family, then a new family live with hers or his parent in a tiny 2-3room flat. Some prefer to rent, but still do it mostly with money from older family members. Less educated a family, less responsibility for a girl.
Grandmothers are everywhere in Russia walking, playing with toddlers and meeting little students at school 24/7. Grandma never asked if she doesn't want to take care of daughter's kid. In Russia it's more like a strange law for all - grandpas and grandmas = nannies for free.