My son is 5 months (actually born the day after yours!), he has only ever slept through the night once or twice. He usually gets up once or twice. Most nights he'll sleep from around 7:30-8 pm to 3 or 4am, then he often wakes around 6am to nurse and will then sleep until 8 or 9 am. So he does sleep long stretches, and he's not up too early in the morning, so I really can't complain, but I don't know when he'll sleep all night! Maybe once I start feeding him more than just breast milk.