Gas

"Sister Ann, aren't you putting on a little weight?" inquired Father Dan during his visit to the convent, suspiciously eyeing her bulging belly.

"Why, no Father," answered the nun demurely, "It's just a little gas."

A few months later Father Dan put the same question to the nun noticing her habit barely fit across her belly.

"Oh, just a bit of gas," said Sister Ann, blushing a bit.

On his next visit Father Dan was walking down the corridor when he passed Sister Ann wheeling a baby carriage.

Looking in, the priest observed, "Cute little Fart!"