Would you be able to create a video that helps a toddler sleep through the night? That would be a big blessing for many families. Unfortunately, toddlers do not wear headphones. Thanks.
I personally wouldn't recommend binaural beats for children, simply because I don't know enough about how they affect sensitive young (still-developing) brains over the long-term. Studies may exist, though I haven't gone looking.
As a parent, one of the (very important!) things you need to know is that your child's sleep patterns (and optimal timing) are going to change a few times before they reach adulthood. To save yourself from a world of frustration, I highly suggest you read "Why We Sleep" by Matthew Walker: https://amzn.to/2H0oupu
Telosa