Deep Breathe! Your milk supply has not disappeared! You are making plenty of milk. The small issue is your baby is not *taking enough milk* - the two things are not the same. She’s only little, hasn’t got the hang of it yet. Normally babies feed at least 8-12 times in 24 hours. So, at 6-7 feeds per day she is not really having enough. Sometimes a difficult birth leaves babies a bit sleepy and not able to demand feeds effectively. Sometimes it’s because they have some drugs in their system from the birth, or are a bit jaundiced. No matter, this will pass. It is boringly normal for babies to lose 10 percent of their birthweight and easy to sort it out if they lose a bit more. What you need to do it help her out til it does. Wake your little one every 3 hours day and night. Let her feed for a maximum of 20 mins on one side. Give her a nappy change/burp/wake her up, and no more than 20 mins on the other side. Contact your local ABA group and hire a breastpump. (Don’t get your sister in law’s dodgy second hand pump - that’s why breastfeeding didn’t work out for her - get the good pump!) Express after feeds and give her back the milk you express. Within a few days the show will be back on the road and formula won’t even be in your vocabulary.