Yes there is. Laura Cirelli, assistant professor at the university of Toronto at Scarborough has done research in the effects of music and frequency on infants. The effects even benefit fetuses in the womb. There is no question that playing music to infants can develop all kinds of benefits as well as advancing musicianship for them. Rick Beato has used these ideas (and then some) to develop his son Dylan, who is now a young man, in to musical genius status.
Here is a clip on the benefits of 432 cps: https://freespoke.com/podcasts/488587/ep201-uncovering-truth-with-alex-the-conspiracy-music-guru?t=2596
I think that is a great thing what your son is doing!
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Vince Mrykalo RPT
www.mrykalopiano.comVisit my blog at:
www.mrykalopiano.blogspot.comSuccess in tuning, as has been said of genius, is the result of an infinite capacity for taking pains.- Tom O'Meara (Editor, Tuners' Journal 1925)
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