Yes, 50th percentile is average, but 190g over three weeks is not a great gain.

Don't stress Rhianon, it could just be a one off. How has his weight been so far, before this latest weigh? What does he average per week? How many feeds does he have a day, and are any of them through the night? Try topping him up with the EBM and make sure he feeds plenty of times throughout the day and night.

I'm sure he'll be just fine When do you get him weighed again?