Sneaky side and back buttons on babies clothes

Has anyone else had the experience of gently struggling to get a t-shirt, jumpsuit or other baby/toddler clothes off and over a child's head only to discover after getting it off said child's head that there were actually buttons on the back or side that could have made the exercise a whole lot easier.

(such as this picture on the right hand side, but they are so sneaky you can hardly see them)