Assuming that happened, I guarantee it was a targeting error. The US and Israel have no actual reason to target children, seeing how they have plenty of useful military targets and want (or at least need) the Iranian people's support for regime change.

For what it's worth, Iran has claimed their strikes on Oman were mistake, and I believe that too, since Oman seems to have genuinely been trying to help them. Just Oman though. They apparently feel fine about all the other strikes on bystander nations.

Last I checked this was never confirmed to have actually happened.