My baby is not a very great eater. She doesn’t breastfeed much and I offer a bottle after she eats and she won’t take it. Before She had a week where she only gained 1.5 ounces at 8 weeks old so I started offering a bottle after every feed and she would take it. Her weight gains went up each week from offering the bottle and things were good. Now she won’t take the bottle after nursing and her weight gain is really low again, she is now 11 weeks. Any ideas???