They grow up so fast!

Jessa Duggar took to Instagram to share a picture of her son, Henry Wilberforce Seewald, and we can’t believe how much he’s grown!

MUST SEE: Do the Duggar Use Blanket Training?! Get the Scoop on the Controversial Technique!

“Getting so big! Already 2 ½ months old and almost 16 pounds,” the proud mama-of-two captioned the pic of her baby boy.

This is the second child for Jessa and her husband Ben, who are also parents to one-year-old Spurgeon! In the past, Jessa has confessed that she wants to have a big family — just like her parents — and hopes to see her dream come true through the miracle of adoption!

MORE: Is Amy Duggar Pregnant?! See Her “Baby Bump”

“It’s not really about any specific number, but cherishing and loving the ones God brings us — whether that be just one or whether it be more, we’ll be grateful,” the Counting On star has previously gushed. “I would love a house full of kids! Ben jokes about wanting 15 sons, but I imagine we will probably have a good mix of boys and girls.”

So far, the new parents have made strides when it comes to their plans to adopt — and have even begun filling out paperwork and applying for a home study visit so they could be prepared when the opportunity presents itself.

We bet Henry will make the cutest “big” brother!

Scroll through to see the Duggar family — then vs. now!