How to give money as Christmas presents?

[BlackLantern]

Usually amazing at giving Christmas presents, really take the time to plan and pick things. Will have a newborn. So thinking about just giving cash for ease.
What age from is suitable for a child to get cash and will understand/be excited and not disappointed? 2/4/6years? I’m thinking still need a gift for the 2 year old, how about the 4?

How do you wrap it so it’s not just a card and is still a thing to unwrap under the tree? Add to a selection box? Empty box weighted with beans? Help!

I've been in similar position. I asked the parents when they were Xmas shopping to also get a present up to the value of X amount on my behalf. I transferred the money. They appreciated the thought (even though i had a lot going on) and as they're shopping anyway it was no extra effort for them. Child gets a gift they've asked for/like. Win win situation

I once used an empty spice jar (well washed out!) and put the notes inside that. Then I wrapped the jar to look like a Christmas Cracker.