Congrats on the baby! All my best to you and your family.
I haven't produced offspring yet, but if I did, I'd set up a cheap speaker system and send in plenty of classical and jazz. The soothing stuff, like Beethoven's Sixth, "Kind of Blue" and "Waltz for Debby," and the mellow 20th century composers like Sibelius and Part. I'd also play some Leo Kottke and laid-back bluegrass, too. You know, I'd put some Galaxy 500 in there too, because they're so peaceful.
I have no idea if that would take root with an infant, but I'd like to think it would. After a couple years, I'd put the Beatles, Beach Boys and the Elephant 6 collective into the mix.
It would be nice to groom a kid to take over the music collection and audio gear.
Though I'd leave out the Captain Beefheart, the Residents, Sun Ra, and Eric Dolphy for a few years.
Oh, and I'd start throwing inexpensive musical instruments at the kid around four. Recorders, drums, toy xylophones, ukulele, etc. and start in on real instruments by six or seven. Along with learning how to read and do basic math, kids
must learn how to read music and play an instrument early on. There are so many benefits. The least of which would be a deep appreciation of music.