A.S.
You have a right to live in an apartment that is free of noise pollution. If this is becoming such a problem that you can't keep your child asleep because of the noise, you can break your lease. Since you have complained to the apartment complex, and you have talked to the neighbor, you have the right to break your lease without paying for the consequence. Look up the laws on noise pollution in your area, but I broke a lease due to the renovations that an apartment was making and I was home most of the day and it was not in the lease that they would be doing renovations. If you have it documented that you talked to the apartment manager and they said that they couldn't do anything about it, and that you talked to your neighbor, then move. It's that simple.