Clicking sounds means the tongue is doing something incorrectly. 
Sometimes it is the flow that is too fast for the baby and he clicks by 
doing something odd with his tongue to handle the flow.

Also, with a tongue tie, the tongue may go up and snap back making a 
clicking sound. The bubble palate and clicking go together and like 
Cathy said, muscle moves bone. The baby could have a posterior tongue 
tie that is not obvious to the untrained. How is the tip of the tongue? 
Do you see a verticle line in the middle of the tip? With or without a 
heart shape. With older babies, they have learned how to breastfeed in 
one way and it takes time and effort to teach them to change. A baby 
this old should be able to latch on well and without pain and gain 
weight without supplementation.

I did a home visit Thursday for a baby who has not gained weight well 
and I suspect a posterior tongue tie. Baby has a rounded tongue tip with 
a verticle stripe or line in the middle. Could not assess if she could 
raise her tongue (baby very sleepy) but she salivated before and after 
nursing and then choked on it. Baby can remove milk well with better 
latch on and with breast compressions. Her older sisters had these huge 
clear, stringy frenulums. They can stretch their tongues out but had 
probably an inch and a half of stringy tissue both across and going down.

Good luck with this, Kathy Eng, BSW, IBCLC (Houston, TX)

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