@SweetieJean - it is possible that a child is born in 2020 does not live with you the whole year; not frequent, but it can occur...
examples:
- baby is born July 15 and is adopted by others on August 15. Can the adopted parents check 'the whole year'?
- baby is born on July 15; parents split up on August 15 and Mom and Baby go live with Grandparents; Grandparents want to claim Baby in 2020. Can Grandparents check 'the whole year'?
But to build on your approach, why couldn't TT use the birthdate and the number of months that is checked by the taxpayer to determine 'the whole year'. So if a baby is born in August and the taxpayer chooses "5 months', then TT knows that it has to be 'the whole year'.
PS - I think this issue of 'whole year' may only be an issue if the taxpayer chooses 1-6 months as you appear to not meet the "over 6 month' conditions.
