So I’m planning my baby’s welcome home party... do you guys think it’s rude to ask for money in the…

So I’m planning my baby’s welcome home party... do you guys think it’s rude to ask for money in the invitation? We don’t have anything for him because we’re moving across the country in a couple of months and we can’t take much so we’d like to buy his stuff when we get there. How Can I not come across ass rude? Help. :(