“Screen time”

Hey moms! So recently I’ve been letting my 14 month old watch videos like the wheels on the bus, 5 little ducks, itsy bitsy spider, etc. Now, of course, I’m starting to worry that I’m ruining him!! What does everyone think about this? It’s usually only 15 min or so when we do. And I’m always sitting with him, usually snuggling. We don’t sit and watch tv and he still loves going outside it’s just nice sometimes to lay down with each other and turn our brains off. Especially being 4 months pregnant! Give me your rules around this. I don’t want it to become something terrible. Thanks!