I just started a new job as a cashier at target and a coworker of mine is 7 months pregnant!!! I think she's single too, any suggestions on how to handle this?

Without knowing what her relationship status is for sure, I don't think any of us can really comment. Obviously she become pregnant seven months ago so I presume she is either in a relationship or unfortunately for the child's sake, split up from one over the course of the pregnancy. If she's married or has a partner still - stay away. It's the decent thing to do. If she's single as you think she is, well, then that's entirely up to you. If you can strike up some sort of mutual relationship then that's great - just be prepared to become a substitute father in a couple of months if that's the case...

One of my female colleagues is 20 weeks pregnant (or 20 weeks next week - can't remember which now...). However she has a long term boyfriend who I know she's been with for at least three years. She's about two weeks older than me and had a great pre-pregnancy figure. I find her quite attractive but of course her relationship status dictates that I'll keep my distance throughout. I'll just admire her growing belly from a distance, which is now becoming quite noticeable. She's always cradling the bottom of it with one hand or another as she stands up and walks!

If shes single go it. She might be interested or might not. Only one way to find out

I agree with Belly Button, my opinion is, strike up a conversation, get to know her a little bit and ask her.

I work at an advertising agency and also have a coworker who is pregnant. I`m starting to talk closer to her and even offer her to bring a coffee when I arrive. I`m starting to think she will be a single mom, bc she moved to her mother`s house now she is close to the due date. The problem is that she is very friend of my boss and I`m afraid she says something to her. But i`m trying.