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It's been a year of firsts for Kendra Wilkinson!

After giving birth to Hank IV in December, the reality star says her son is already starting to find his way around the new Philadelphia condo she shares with hubby Hank Baskett.

"He started crawling a couple of days ago," Wilkinson, 25, told at E!'s TCA cocktail party in Beverly Hills on Friday. "He's starting to learn now and take everything in. He's such an explorer!"

But even when 8-month-old baby Hank has trouble getting around, his proud mom happily encourages him to get up and try again.

"When he's falls, I'm like, 'You better get up!'" Wilkinson told Us. "I'm not the mom that's going to make him a little wuss. He doesn't fall hard. He'll look at me like, 'Okay!'"

And while Wilkinson continues to revel in her son's many milestones ("He's starting to putting his little baby language together," she gushed), she's also enjoying the success of her bestselling memoir, Sliding Into Home.

"I'm so thankful that people wanted to pick up my book and give it a chance. It makes me even more excited when people say, 'This chapter related to my life,'" Wilkinson told Us. "I'm just like, 'This is amazing!' Before, when I was writing, I was like, 'Why am I writing this book?' But my fans reminded me why."