Trig was born April 8th, Bristol’s baby was born December 29th.
Now how would Bristol give birth on 4/8 and again on 12/29 to a normal weight baby? Extremely unlikely. I’ve heard of a years difference but not 8 months although I suppose it isn’t absolutely impossible.
I have an aunt that’s first to kids are 9.5 months apart and the second one was a 5# baby. So yes unless the second was a extremely small premie it is impossible.