Just a little gas

A nun was walking in the convent when one of the priests noticed she
was gaining a little weight. "Gaining a little weight are we sister
Susan?" he asked.

"No, Father. Just a little gas," Sister Susan explained.

A month or so later the priest noticed that she had gained even more weight.

"Gaining some more weight are we Sister Susan?" he asked again.

"Oh no, Father. Just a little gas," she replied again.

A couple of months later the priest noticed Sister Susan pushing a
baby carriage around the convent. He leaned over and looked in the
carriage and said,...

"Cute little fart."