Question

Meaning of "children's are like angel with the wings decreasing ,as their legs grow"

Answer 1

it means dat as d power of socialism and evilness is growing in our society it is affecting the children and in d mean while they are losing free innocence and getting in dis dirty world of evilness Thus it in no more pure

Answer 2

That means that the kids are divine and like angels.  When they start growing, they slowly become worldly and selfish.  Their divine wings diminish in size.  Their physical body grows.  As they become adults/teens, their innocence, divinity, Godliness, purity reduces to zero.  Their wings vanish.