I found a really cute shirt at Target today. I bought it a couple sizes too big to accommodate that growing baby. The problem with shirts that are a couple sizes too big is that there is too much room under the armpits and the chest. This was my simple solution.
Just a few rows of shirring made a big difference. It could probably use more but I'm leaving it this way.
It looks much better now from the front. Less like a too big shirt and more like a maternity shirt.