Feeling guilty?

Is it weird that I feel guilty giving

My son breast milk in a bottle? He is EBF and we have been introducing the bottle for about a week now since he has to go to daycare

Soon. Sometimes he doesn’t mind the bottle and other times he refuses to take it. When he does take the Bottle for Some reason I feel guilty like I should allow him to breast feed since I’m right there and he prefers it. Anyone be else ever felt this way? He is still getting breast milk in his bottle so why do I feel like this!