Can a child, who’s the age of Chinuch count with a Beracha before the zeman, if his bed time is before the zeman?
Also, if a child missed a day, can he continue counting with a beracha?
You can count with the child from after shkiya, since it is bein hashemashos, and b’dieved it is considered counting, and we can rely on this for a child.
If the child did not count at night he can count during the day but without a bracha. This is since during the day we don’t make a bracha, we are not going to make the child say one.
O:CH 489-2, 7, M:B ibid15,