When to buy a crib

Carlyn
I'm 30 weeks and 3 days pregnant, and we're using a cradle. But I want to get a crib and get the nursery set up before the baby is born. But my mom is trying to convince me to wait until the baby is growing out of the cradle before I buy a crib... But I feel like I won't have the time, money or energy to get the crib when that time comes.... Any ideas?..