Of F's and B's

When my 4 year old wakes up in the morning crying, and telling his dad " B for Baba has got stuck in between.."
What is supposed to be done?

And when i tell him it is only a dream and " we will pull B out from there", he looks at us with gave concern and continues " F is also stuck with B!"

Should i be worried? Is he having an overdose of alphabet learning?

For those who thought the header meant something else, please get your minds disinfected. We don't say such things, at least not loudly, not in front of V.

PS: TB will disagree, he's caught me saying some choice words with V around. Thankfully V has not learnt any YET!