I wouldn't worry at all about the drop from 50th to 40th. Those charts are really meaningless. She has gained and will continue at HER own rate. She is still gaining and you are doing a great job! I am not sure what advice to give other then if you do decide to give her a bottle here or there it is NOT going to hurt her. breastfeeding IS hard and not just at the beginning. It is a HUGE commitment. You have to do what feels right for you.

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Patty 37
DW Julie 40
"domestically partnered" since 1994