Source: Rob Kardashian/Instagram
October 19, 2016 09:18 AM

Rob Kardashian is getting closer and closer to fatherhood — and he’s determined to be healthy for his daughter.

The Rob & Chyna star took to Instagram Tuesday evening to share a motivational post vowing to lose weight for his baby girl with fiancée Blac Chyna, whom the couple is expecting in about four weeks.

Kardashian, 29, put together a side-by-side of him and Chyna, 28. The photo of Kardashian is from a few years ago, prior to his weight gain, and the photo of Chyna is from before her pregnancy.

“Oh yeah we snapping back lol,” he wrote. “Baby will be here in 4 weeks and I’m done with carrying this pregnancy weight. Me and my baby gonna be right. MOTIVATION TIME! We almost there Chy. F— Chy looks so bomb here aghhh!”

Over the past two years, Kardashian struggled with significant weight gain that led to a diabetes diagnosis last year.

Though Kardashian told PEOPLE in August he was diabetes-free — and credited his future wife for helping him focus on his health — his weight struggle was an ongoing theme on the recent season of Rob & Chyna.

RELATED VIDEO: Rob Kardashian and Blac Chyna Can’t Wait for You to See ‘The Real Us’

Last month, a source told PEOPLE Kardashian is “extremely bothered by his weight gain.”

“It’s not like he let himself gain weight because he doesn’t care,” said the insider. “He just hasn’t been able to mentally motivate himself to do something about it. It’s like an evil circle — the more he gains weight, the worse he feels mentally.”

“Rob is a great guy,” added the source. “His struggles are very sad. It seems they could be fixed with help.”

Keeping Up with the Kardashians returns Sunday at 9 p.m. ET on E!

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