As between Bitcoin and Baby shark, the choice will be obvious.
Please don't mention that song, I don't want to have it stuck in my head again. 
And why not explain bitcoin while baby is still in? Coz when baby gets out, it can already make an investment lolz.
Yeah, it would probably have the same effect as if explaining it to a toddler as its proven that baby can hear while they are in their mom's stomach. 