breast to Bottle

Hi! Anyone else having trouble teaching baby the bottle after breastfeeding exclusively? My sone is 5 weeks old and seems confused by the bottle- just sort of Che's on it instead of sucking. We've tried a few different nipples but he can't seem to catch on, and actually gets quite fussy if my husband tris for too long. Since I am jaded back to work in a few weeks I'd like to teach him as soon as I can!  Thank you!