The president got a mouthful of little fingers thanks to 8-month old Cooper Wagner when he visited the Marine Corps Base Hawaii. Obama laughed off the incident and said he thinks the baby liked his "big nose."
Earlier that day, the first family attended church services at the base chapel.
The president also called service members stationed around the world Christmas Eve to thank them for their service.
The first family is spending their holiday vacation in Hawaii. They woke up early Sunday to open gifts, the White House said, then had breakfast and sang Christmas carols at the multimillion-dollar house they rent in Kailua Beach, near Honolulu.
The Associated Press contributed to this story.