My nearly 4 months old baby (will turn 4 months in 9 days) suddenly refuses to take a dummy! He cries and spits it out. He's ebf but has been using dummy for daytime naps. Now he only wants a boob and he cries hysterically before each nap and before bedtime (which is now at around 6.30-7pm). Only boob can calm him down and not even always. I understand that might be the dreaded sleep regression coming, but why refuse dummy?! It used to be a lifesaver. Anyone experienced this? Thank you.