My baby's stomach doesn't get filled when I feed him in sleeping position. Has anyone experienced this?

Hi Anita, It would be easy to understand if you had mentioned how old your baby is. But anyway, I do not think that in sleeping position the baby would remain hungry and not get fully filled. Probably he needs a little break to complete the feeding. So, try waiting for 5 minutes when he doesn't seem interested in having food and feed again after 5 minutes.