what about Delta internationally
Children's Baggage Allowance
Children’s baggage allowances are based in part by the fare paid for their travel. See the guidelines below.
Unticketed Infant/Child
If children are traveling for free, they don’t have a baggage allowance. So any baggage for the child counts as part of the adult's baggage allowance.
Ticketed Infant/Child
Children traveling on an international ticket that is 10% of the adult fare are allowed one checked bag up to 20lbs. (10kg) with a maximum outside dimension (length+width+height) of 45 inches, plus one checked fully collapsible stroller or push-chair.
Children traveling on a ticket that is 50% or more of the adult fare, children are entitled to the standard baggage allowance.
See Child Fares and Ticketing for Delta's current policy on special fares & discounts.