When your kid joins your family on Till you can request a physical card for them.
To learn more about how to do this see How do I request a physical debit card for my kid?
If you’ve already requested a physical card for your kid, it can take up to 2 weeks for the debit card to arrive. Please ensure that you reach out to us after 2 weeks if you haven’t received your kid’s card. We'll help you figure out what happened and re-ship you a card if needed.
Don’t forget that a virtual card was issued, and can be accessed through your kid’s Manage Card settings within their Spend Balance, so feel free to have them use that and add it to their Apple Wallet (must be over 13).