Girard, 34, gave birth to a bouncing baby boy named Jett David Newman on Oct. 20. Jett, who came into the world weighing 6 lbs. 11 oz., is Girard's third child, but her first with fiancé, David Newman. Jett joins Girard's daughter with ex Matthew Hilliker, 15-year-old Kalani, and her son with ex Jason Girard, 8-year-old Jax.
In a recent sitdown with ET, Girard admitted that her age made this pregnancy more challenging than her previous ones, but she credited exercising and stretching with helping her bounce back and said she was "much more active" during this pregnancy than the two before. She also was able to keep her diet in check.
"I'm really big on vegetables and fruits," Girard told ET. "My husband, David, is big on juicing. With Kalani being so active we all try to maintain a healthy diet. She keeps us all on track. We try to stay away from fast food chains. I cook a lot and get really creative in the kitchen."
The 40 to 45 pounds of baby weight she put on has been quickly disappearing, as she demonstrated in an Instagram photo last week.
"Two weeks postpartum and feeling great," she wrote as the caption to the selfie, showing off her svelte figure.
Girard dished to ET about how she's been dropping the weight.
"I think it's my busy lifestyle, and I'm also breastfeeding, which is a huge thing," Girard said. "I didn't do that with my other two. My diet is key. Those two [things] combined are helping me shed the extra pounds."
Girard formulated an attack plan for keeping up with her healthy eating habits when she was still carrying Jett. Girard explained that the biggest thing she learned from her previous pregnancies is to prepare meals ahead of time.
"Sunday we'll do meal prep and prepare everything and get it ready for the rest of the week," Girard said. "Then, it's pulling the meals out and preparing 10-minute meals real quick. We love eating at home and not out because that's the number one thing that puts the weight on."
As a business woman, fiancee and mother of three, Girard knows what it's like to feel overwhelmed by responsibilities, but she says the most important thing to do is to implement a schedule.
"Organization is key," Girard said. "Just keep going. Don't stop! If my son has a baseball game, we go to baseball -- yet we still have to keep up with baby Jett's feedings, make sure he's napped, and that Kalani has what she needs. It's teamwork, but if it weren't for my schedule, I'd lose it."
For more of Girard's post-pregnancy journey with Jett, check out her Instagram page here.
--Reporting by Brendon Geoffrion