LO is 6 months old, and all winter he mostly wore long sleeved onesies with pants. For the summer I have some short sleeved onesies for him, but I also got some t-shirts. Whenever he wears them, though, they ride up and show his diaper (not cute)!

How do you fix this - should I put a plain white tank top onesie under the t-shirt? Will he be too hot in that when the weather gets warm?