Melissa Joan Hart says that her second baby is kicking like a maniac and she is getting ready for its arrival by making some major changes around the house.

“We actually moved Mason into a big boy room and left the nursery the way it is,” she said recently about rearranging the house to prepare for their second child. “It’s very neutral.”

“We made him a big fish [themed] room,” she says. “It was his birthday a few weeks ago, so we got him a bed from Pottery Barn – and my stepmom came and put murals on the wall of fish, whales and turtles. It’s huge, and he’s got a fish tank now.”

With all the activity, one thing still hasn’t slowed down: her baby is still kicking. “[The baby's] been way more active than our first son,” daddy Mark Wilkerson said. “Every day [the baby's] doing aerobics in there.”

WENN