I was so happy to see that old navy carried maternity clothing while I was pregnant. I found their clothing super affordable especially compared to other maternity stores. The majority of my maternity wardrobe for both of my pregnancies came from old navy. I had 2 pairs of maternity jeans that were extremely comfortable. One had the shorter panel and the other had the longer one which was very useful the bigger I got. I also had some really comfy t-shirts and a few cute dresses. I also really liked the tank tops.
The verdict: It's a cliché, but dungarees look really cute on a pregnant body, no? That said, they're not always the most practical when it comes to those frequent toilet breaks (if you know, you know). That being said, these were comfortable but sturdy. You probably won't find them as easy to wear in the later months though, as they're not as stretchy as the other pairs.
Pros: 1) The staff were very helpful and friendly and welcoming to us and our beloved small dog. 2) Very reasonable prices -- which seems unusual in maternity fashion retail. 3) While my wife and I did not love any of the designs available in the store (she was looking for a relatively formal dress for her baby shower), there was one we quite liked, and they had a much greater selection of casual ware. 4) My wife tells me there were huge, well designed change rooms. There was a nice place for me (and other men) to sit so I could do my yelping while my wife tried on clothes. Cons: 1) There were some ads on the wall with models wearing especially nice maternity clothes, but the particular style we liked the best was no longer available to purchase. I prefer the practice of many other chain retailers of advertising particular styles that are actually available to buy. 2) Not so good (although perhaps understandable) return policy. Everything on sale is no return and the one dress we liked just enough to buy, we learned at checkout was no return also (even though it was not on sale) because it was classified as an "occasional" or "party" dress. My wife was on the fence about the purchase anyway and this was enough to make her change her mind and not buy it.