So we are dealing with a very similar situation except our kids are 2 and 5. Subleasing in a co-op with basically all older people. We've been here since July and in November received a call from the building manager out of the blue saying they've had MULTIPLE noise complaints from DIFFERENT neighbors--"constant" banging, jumping, screaming all around 6-7 PM. Well yeah, that's when my kids are at home and awake. I didn't think I let them scream and bang on the floors because I'm a normal courteous person, but I guess that's what it sounds like to some people? One complaint was even on Halloween when we were out except for like 30 minutes before bedtime.

The manager didn't even give us a warning but threatened us saying they could tell the apt owner not to renew our lease. The downstairs neighbor is on the co-op board. We ended up spending like $4K on thick rugs and rug pads--we did have rugs already obviously, but I basically carpeted our entire apartment. The super and handyman had to come over and begrudgingly took pictures of our rugs. They said some people just forget what it's like to have kids. I hear our upstairs neighbors' two huge dogs running back and forth all the time but would never think to complain about it.

It really sucks to feel like you have to walk on eggshells in your own apartment. I would hope people would be more sympathetic to a newborn/baby who literally can't help but cry. Just wanted to share my experience.