Because many reasons I guess, and among others the jealousy of Erica, exactly when I am breastfeeding, Ava started to drink less and not to gain so much weight. Non the less, I assume she is not a Buddha kid like her sister and I was a skinny/ fit : ) baby as well. However, kindergarten being closed didn't help as well, with both girls together all the time. Every time I breastfeed Ava, Erica needs me, in the next second and if I don't pay attention to her needs right away, she starts to cry, to scream and in the end Ava would look after her, after the noise, or I have to stop the breastfeeding to make what Erica wants and then to return but at the return she doesn't want to eat anymore and so on... However, the milk supply gets lower and lower if the baby doesn't eat properly and I was advised to pump milk in order to be able to continue to breastfeed and even to offer Ava what I pump, maybe she accepts it. In this manner I still have milk and she gets to drink it ...