Hi, baby is 3 months old, tries to suck on a dummy but it pops straight back out of mouth. Started to suck on fingers and thumbs but I'd rather them take a dummy than suck there thumb. I feel like they are drinking 8 oz of Hipp organic milk every 3 hours to crave suckling on a dummy aswell. Has anyone got any good advice to help turn this situation around. I've tried lots of types of dummies that boots, superdrug etc are selling but none have helped.