Following her surgeries, she was forced to spend her first six weeks of motherhood unable to get out of bed.
In his new post on Thursday, Ohanian, who tied the knot with Williams in November, wrote next to a picture of his wife and child, "I can't imagine life without these two."
"This ordeal, as well as the weeks and months after, has made me an even bigger advocate for paid parental leave (not just for my employees--men & women alike--but for all). We're blessed in a lot of ways and I couldn't imagine a new parent going through all of that without all the support, financial security, and flexibility we had," he added.
The Reddit co-founder also shared beautiful pictures from his Vogue shoot with his wife.
Ohanian also told Vogue earlier this week that he thought Williams' health complications made her first few months of motherhood "even harder."
"On top of everything she was going through, the feeling of not being able to help made it even harder," Ohanian told Vogue of his wife. "Consider for a moment that your body is one of the greatest things on this planet, and you’re trapped in it.”
In that same interview, Williams joked about her new daughter, "We're not spending a day apart until she's eighteen."
ABC News' Catherine Thorbecke contributed to this report.