Help!!!! Is the chick getting Overfed ?

I have a cockatiel chick of 11 days old, completely being taken care by its mother. We perform the necessary cleaning and nutritions. I read usually the crop size starts to reduce by the time they are 10 days old. And usually it is okay looking sizes , but today evening it just seemed too big to be comfortable. is it really concerning and should I consider separating the chick or not letting the mother feed for the night ? There seems to be extra lumps near the neck which wasn’t there before after previous feedings.