Pregnant Jill (Duggar) Dillard and Her 1-Year-old Son Compare Bellies in Cute New Pic

The 25-year-old 'Counting On' star debuted her growing baby bump on Thursday.

Comparing bellies!

Jill (Duggar) Dillard debuted her growing baby bump in an adorable pic with her 1-year-old son, Israel.

On Friday, the Counting On star Instagrammed a pic of herself standing next to her son as he proudly shows off his "food belly."

"#comparingbellies after Israel had dinner," she captioned the cute mother-son snap.

WATCH: Jill (Duggar) Dillard Reveals Why She Can't Go to School Anymore

The 25-year-old mom shared another precious post with her son this week, sending a birthday shout-out to her siblings, Jana and John Duggar.

"Happy birthday to Jana and John @duggarfam We love y'all!," Jill captioned a video message to the 27-year old twins. 'You're such awesome bro and sis, aunt and uncle! Hope your day is wonderful!"

MORE: Jill Duggar and Derick Dillard Under Fire for Taking Vacation From Their Mission Work in El Salvador

Jill and her husband, Derick Dillard, announced that they were expecting their second child in December.

See more on the baby news below.