Baby's penis swells when urinating...is this normal?

My 7 month old son's penis balloons up when he is weeing and goes back to normal as soon as he is finished. Is this normal? It hasn't always been like this and he is in no distress when he wees and it isn't red or swollen in general, just triples in size when weeing.This is my first child so really have... show more My 7 month old son's penis balloons up when he is weeing and goes back to normal as soon as he is finished. Is this normal? It hasn't always been like this and he is in no distress when he wees and it isn't red or swollen in general, just triples in size when weeing.This is my first child so really have nothing to go on. (Nb: my boy is has not been circumcised.)

Serious answers only please.
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