If you want to get married and have kids, you should just do it. My wife and I had our daughter while we she was still in law school and I had just graduated. Taking care of a kid is a lot of work while both working long hours at big firms, but why that's what grandparents are for. There is no good time to be sleep deprived for months doing night feedings. At least in your 20's you have the energy and your parents are young enough to help out!