Assalaam alayk...

My husband and I have been putting aside money in specific bank accounts for our children since they have been born,
intention is that the money belongs to the kids, and if and when the need arises we may then use from their monies for themm...
My question is that seeing that the money belongs to the children and they are not mukalaf. is it waajib to give zakaat on those amounts....

Jazaakallah...