A pregnant model whose sexy selfies featuring her tight abs turned her into an overnight internet sensation has given birth to a healthy baby boy. Sarah Stage, a 30-year-old underwear model and animal rights activist from Los Angeles, welcomed James Hunter into the world on Tuesday afternoon. And despite her critics' claims that her unusually trim figure could be damage to to her unborn child, it seems their fears were unfounded. Sarah confirmed to E! that baby James weighed in at a healthy eight pounds, seven ounces and was 22 inches long at the time of his birth, adding: 'He's a big healthy boy and he got an APGAR score of eight to nine.' Scroll down for video . Ready to go: Sarah Stage took her last pregnancy selfie (pictured) on Monday, writing: 'Still waiting'.  The 30-year-old gave birth to a healthy baby boy named James Hunter the next day . Feeling hungry: Sarah shared this photo of two In-N-Out burgers on Tuesday afternoon, although its not clear as to whether or not she enjoyed the meal before or after she gave birth . An APGAR score, which stands for Appearance, Pulse, Grimace, Activity, Respiration, is a quick method for assessing the health of a newborn, with scores of seven or above being considered normal. Sarah famously documented her changing figure via her Instagram page throughout her pregnancy, earning herself a huge number of fans - as well as a fair share of critics - in the process. Although the mother-to-be came under fire last month as more and more critics spoke out against her unusually trim and toned figure, claiming it could be harmful to her unborn child, their comments never stopped the model from sharing numerous photos of her tight abs with her 1.6 million Instagram followers. Almost there: Sarah cradled her baby bump to in a 'sexy' purple dress to celebrate her 39th week of pregnancy . 'Yesterday afternoon, Sarah shared a photo of two In-N-Out burgers, writing, 'Cravings,' although its not clear as to whether or not she enjoyed the meal before or after she gave birth. The lingerie-clad model snapped her last pregnancy selfie on Monday, which she captioned: 'Still waiting #9months [sic].' The snapshot of her in a black bra and thong underwear has been liked nearly 40,000 times since it was posted, and has earned nearly 4,000 comments. And Sarah, who is of European and Costa Rican descent, took to Instagram last week to share a photo of growing belly during her ninth month of pregnancy, writing: '10 days until we meet #BabyJames.' Many women noted that they found Sarah's pregnancy body to be motivation to work out and live a healthy lifestyle. So soon: Pregnant model Sarah Stage snapped this photo of herself flaunting her barely-there baby bump 10 days before she was supposed to give birth to her son . Haters gonna hate: Sarah, who came under fire for her being tiny and toned throughout her pregnancy, told her critics to unfollow her if they have a problem with her pictures . Proud of her bump: Sarah struck various photos for these selfies of herself in her underwear . 'I'm completely inspired to go to the gym first thing in the morning. You look absolutely gorgeous @sarahstage #amazing [sic],' one fan wrote. 'You look absolutely lovely. Hats off to you for being fit and taking care of yourself!' another added. 'If I ever have children, I'm inspired by you to treat my pregnancy the very same way. I'm sure James will be amazing! Congratulations.' Others compared their figures to pregnant Sarah's pregnancy body, with one woman writing: '10 days before giving birth?! Lord Jesus help us all! I look like this after dinner [sic].' 'I look like that after a good meal or two,' someone else commented. Meanwhile, some people suggested that her son would be as tiny as she is - although now it seems that their fears about the young boy's size were unfounded. Bump to bump: Sarah and her friend compared their growing bellies for this playful picture . Just like dad: Sarah shared this adorable photo of matching father and son Timberland boots . 'Baby James will come out the size of her phone case,' one person commented, referencing the model's bear-shaped cell phone cover. And when she's not sharing lingerie selfies, the new mother regularly shared pictures of her son's nursery and his future wardrobe. Last week, Sarah shared an adorable photo of matching father and baby sized Timberland boots, writing: 'Daddy & baby shoe game [sic].' And despite her critics, Sarah refused to hide her then-eight-month pregnant body in maternity clothes. Stylish mom: Sarah refused to wear baggy clothes during her pregnancy and instead opts for figure-hugging dresses like the one she is wearing in this picture . Looking good: Sarah wore this sexy black dress on a 'date night' when she was 37 weeks pregnant, two weeks before James was born . She shunned baggy dresses and instead dressed her bump in fitted Lycra or nothing at all. The fitness fanatic loves hitting the gym and captures herself working out, as well as following a healthy diet of quinoa,spinach and chicken. Clearly not letting her growing baby bump get in the way of her career, Sarah continued to proudly model whilst carrying. Two weeks ago, she shared a sexy snapshot of herself in black underwear and responded to her haters. 'BTW If you don't like my pics then unfollow me,' she wrote. 'I'm excited, happy and enjoying every second of my pregnancy. Can't wait to meet James! #NFG #37weeks [sic].'
Sarah Stage, 30, welcomed James Hunter into the world on Tuesday afternoon .
Her baby boy weighed eight pounds seven ounces and was 22 inches long at the time of his birth .
As her pregnancy progressed, the model came under fire from critics who claimed she was 'unhealthily' trim and toned .