Congrats!
Audio is fun. Baby's and toddlers are even more fun... that is unless you're spending your time blocking and tackling so they don't destroy your gear.
As soon as my first child started to pull herself up from crawling to standing, my Maggies became her go to spot, especially because they magically make sound and play "wheels on the bus." Child barriers never worked, they just bumped up on the equipment. Shocking the baby and squirting her with water never worked either.
My advice and this is what I did, get some sturdy speakers in there that will do the job for a few years. My go to was a pair of Vandersteen 2Ce Sigs that I had in storage. When your last baby turns 5 bring back the Maggies. In fact, maybe get even bigger Maggies, with more amplification, and a better source too, after all you had to sacrifice so much for 5 years.
Enjoy!