“ In NJ, only apartment houses are required to have window guards, not residential homes. ”

Are children less likely to fall out of an apartment house than a single family home?

that could ruin you if a kid fell out one of your windows and became paraplegic. The standard for tort liability is what a reasonable person would do to prevent foreseeable harm. It's foreseeable that a small child could fall out of an unguarded window and be seriously injured as the result of a two-story fall, and a jury could conclude that in light of this foreseeable possibility, a reasonable landlord would install window guards. You might also check with your insurance company.

Can you seal the windows on the second floor shut? Or, seal the majority of them shut and install a few window guards strategically so they can open windows for cross-ventilation. Might be a way to meet them in the middle.

That should the disabled need special equipment beyond expressed items, the disabled could pay for installation of things like that. That landlords can’t refuse to install but don’t have to pay for it.

Anyway are these children disabled?

I think if they want window guards I’d to get written permission from the landlord (you?) to install them and at the end of the tenancy put the property back into its original condition.

I think city can have requirements for disabled but not for protective parents.

It would depend on what type of windows that are on the 2 story. Here is one example from Home Depot and few others from Youtube. I hope this helps.

Tel ‘em to go ahead but any damage done in the process will need be covered by said deposit.

I finished four years with a family with four children, two of whom were ten when they first moved in. No problems.

I've rented to many (over many years). My instinct (gut) would be telling me that these tenants will be a constant pain in the ass.

I think they should put their own window guards (whatever that is) on if they seem to think their tot will be roaming free and climbing out of windows.

Put this on them. But I kinda agree with the above as well. They may be unreasonable all the time.

You mean I could have gotten my landlord to child proof my apartment?
Look, they have the responsibility to see that the kids are safe-not you.
Send them down the road

As much as I consider child safety to be paramount, I do wonder where the responsibility for landlord ends though since you bring this up. Are you responsible for fencing the yard to prevent children from running into the street and in the path of cars? Installing barriers to trees to prevent children from climbing and potentially fall from their limbs? Removing any ornamental plants that, if ingested, could be toxic?

Where does "reasonable," begin and end?

Be careful other requests may be coming