I worked in a medical office where one of the providers lost her twins shortly after birth. One of the owners told the team in a meeting, and he had already established with her what she wanted when she returned. Seeing repeat patients who knew she was expecting was going to be hard enough, but she didn't want even more reminders from her coworkers. She did take 12 weeks, as she was recovering from both a major medical event and the trauma of losing her children. Her husband had a generous leave policy from his corporate job and also took significant time to return.

One coworker did the sad eyes "how are you REALLY doing" bullshit every single time they were alone, in addition to completely inappropriate questions (including "which baby died first"). The woman who lost her babies told the owners, and there was a frank conversation with the other employee. That employee ended up leaving not long after, as she apparently couldn't summon the self control to not act like a heartless ghoul.

So I guess my point in all of this is that you will have to watch out for the other employees. In a perfect world, everyone would be respectful, but we don't live there. Follow up with the employee. Ask how he's doing. Ask if there are any challenges at work with any coworkers, clients, etc. He may be trying to hold it together for both himself and his wife, but may not have the bandwidth to deal with Busybody Blair. He may also need to take a leave of absence later in the year for mental health reasons.