As if a 4-month-old baby isn’t enough to keep a new mom busy, Saved by the Bell‘s Tiffani Thiessen says her infant daughter Harper Renn is overly active for her age:

“She rolled over really quickly, which kind of scared the crap out of me,”

“She’s already been scooting for a couple of weeks now! I think she’s going to be an early walker, which frightens me.”

Tiffani announced her pregnancy with husband Brady Smith last November. Little Harper was born in May.

In addition to keeping up with her newly-mobile daughter, the White Collar star is starting her own line of children’s bedding, furniture and wall art, called PetitNest.

“I’m overwhelmed, but for all the right reasons,”

Phew, I bet!

LOVE the new line, though — I’m sure all of Tiffani’s sleep deprivation will pay off in the end.

Congrats to the new family!