My daughter is 17 days old and we've been feeding her about 2 oz. every 2 hours during the day and about 2.5 oz every 3 hours at night. For the last day or two, she seems like she could eat more than the 2 oz. that we give her during the day but I don't want to overfeed her. We are doing a combination of pumped milk and formula. Should we be feeding her more? We don't have our 2 week check up until tomorrow afternoon and the last time we checked she was not back at her birth weight yet. Help?