It is absolutely normal. He is only 2 months after all. If you are really planning on EBF then you need to nurse on demand and not supplement with formula.
I have nothing against formula, but if your only doing it for some sleep......
EBF babies, especially at only 2 months, will nurse ever few hours. Then there will be the times when a growth spurt happens and they will want to cluster feed.
As he gets older he will begin to sleep for longer periods of time. I believe the experts say that around 4 months babies begin sleeping longer and it is when many parents begin sleep training.
It sounds like you are doing a terrific job.
For what it's worth, I've had friends who were able to nurse their little ones while they were in an Ergo carrier. I never tried it with my son, but I know so many women who nursed their second babies standing up in the playground or even walking down the street after their other children. The Ergo provided coverage and the babies seemed really comfy. Kind of cool. I'm sure a sling would work this way as well.
If I am blessed enough to have another baby I'll have to give it a shot.
Good luck and keep going. If you find that formula works for you though then go for it. Don't let others pressure you to go either way. I've said it before and I'll say it again. It's your body. Your baby. Your decision.
Peace.