When did your new born start to gain weight?

M
My daughter is a week old today, she's a premie in NICU. She weighed 4p10o when she was born, but after a few days, she had lost the water weight and was 4p6o. She eats half breast milk, and half supplement formula (I haven't been able to produce enough) we asked the NICU nurse to check her weight, and it looks as though she did go up to 4p8o 2 days ago, but today has gone back down to 4p6o. She has no difficulties eating and is currently feeding at 45cc (close to 2 ounces, every 4 hours) gaining weight is her last milestone before she can get discharged from NICU. 😔