Oh, dude, you can't just buy a child! That's like, super illegal and totally messed up. If you're looking to expand your family, there are proper channels like adoption agencies or foster care programs. Remember, kids are not for sale, they're tiny humans, not commodities.
Yes, you can buy an I bond for your child as a parent or guardian.
If you can afford it, yes you can buy your adult child a house in Ireland.
yes you can buy that learning computer for your child that can support to increase you child knowledge, you will get it from amazon.com, ebay
Hopefully you can't "Buy" a child from any nation. There are steps to adopt a child from other nations.
You dont
There are many places where one can buy a safe cycling helmet for a child. One can buy a safe cycling helmet for a child at popular mass retailers such as Walmart, Target, or Shopko.
I ask The question
It is a sin because you give everything to your child what he or she wanted. You can give your child something but with discipline or with explanation. For example, your child asks you for an expensive toy. You can buy him one but do not buy him something next time like months and explain him or her why so he or she can understand why can't you buy him or her a toy. Do not easily give up when a child wants something. If you do, the child would keep on asking to buy him or her something. You are a parent and you know what's good for your children.
yes
From amazon.com, for $4.74
no
buy the child what ever he/she needs like a bottle