It's like inheritance for our children, nothing bad if we will help them to save for their future. But don't mention it to them that we've got something for them with bitcoins that's saved for them. We know that kids are quite naught and if they know that there is something for them, they'll totally be confident and will use that money for sure. Teach them while they are children that bitcoin will be the future of money and investments but as I said, don't let them know that you have saved bitcoins.
It can serve as a surprise if our child is old enough. I feel happy if I can see my child can live happily because they can get what they want. In the future Bitcoin could have a high price value and this could make us call bitcoin a treasure. and do not forget to explain how to open an account that we have, maybe I would be more confident if storing it in an offline wallet, so we just save the confg file and tell the password in a piece of paper.Yes it may serve as a good surprise when they get older but just don't really get excited to tell them. No one wants to see their child living in miserable life and having a lot of struggles dealing with financial matters that's how parents are living for their children. I'm not yet a parent but I know on how the feeling of a parent because I felt it on how they raised me up until now I'm with them. But they didn't showed me any assurance that I will have a good life depending on them. Explanations can be easy when the right time comes.
Bitcoin is really volatile. Maybe after few years other cryptocurrency will hits record highs. But it's cool idea if you have opportunity to save some bitcoins. The main problem is how to ensure the safety of the wallet for years. 
