They grow up so fast!

It seems like just yesterday we were celebrating the arrival of Traci Harrison Tsou’s baby boy Jacob — so it’s hard to believe he’s already nine-months-old!

The former Little Women: LA star marked the special occasion on Instagram, writing, “Our little fish turned #9monthsold this past Friday! He absolutely loves the water, putting his face in and splashing everyone in the pool. He gives high-fives, can clap and loves watching baseball with his Dada. He doesn’t have any teeth yet, but is constantly teething. He loves to eat by gumming his food and pretty much loves everything, especially bananas!”

Happy birthday, Jacob! We hope your day was filled with lots of swimming and even more bananas!

Scroll through the gallery to see even more pictures of Jacob!

Be sure to tune in to LW:LA every Wednesday at 9 p.m. on Lifetime!