Your week old baby is now full of energy and very active. He needs a lot of time on the floor to explore things around and also exercise his limb muscles for. This means that if you give birth to an infant before they are 24 weeks old, their chance of surviving is usually less than 50 percent. By the time you're 24 weeks pregnant, the baby has a chance of survival if they are born. Most babies born before this time cannot live because their lungs.