Honestly the transition is harder on you than it is on them. At that age, I'm assuming your daycare will follow LOs schedule? I think I wrote out a very detailed sleeping and eating schedule for them. And for the first few days, I would call and see how he is doing. But again, that was more for me.
So I guess the good part is that, for them, they aren't really aware enough to experience separation anxiety or whatever. I remember being upset the first few weeks that I would just hand him off and he'd keep sleeping or not miss a beat. Like hey kid... I'm your mom!!
But you and I both have the advantage of them starting really young. So the majority of the adjustment will be on you and not on your LO. Cut yourself some slack, try not to overthink it, and recognize that it gets easier after the first few weeks.