Help!!!

Di

So our doctor was concerned about little mans weight at his last appt. We weighed 10 lbs 3 oz at 7 weeks the appt. we started to increase his feeding schedule to get an extra feeding in during the day since our man likes to sleep during feedings. Looked like we were doing well but then he got pink eye from day care. Took him to the doctor for the pink eye and he weighed 10 lbs 10oz on Sunday. We just weighed him and he now weighs 10 lbs 6 oz. He has lost weight this week and been super lethargic. He isn’t really eating during the day while at day care. He has also been a little congested.

I’m at a loss. Is this part of the leap or do I need to get him in to see the dr ASAP? We have a weight check on Wednesday.