Can someone explain the "triple feed breast feeding" to/for me? Doctor is concerned about the baby's weight lost since birth and said we need to triple feed 😔

Ladies, is there any hope? My 2nd Beta tripled, but my 3rd Beta didn’t even double!?? My numbers are as follows:

Triple chocolate cake, don’t judge me😌
How many mamys breast feed & formula feed ?
100 days until my due date! Still really far out but, last day in triple digits! :D
I was told to feed my son every 3 hrs and to wake him if he's sleeping. also to pump after feedings to help build supply and drink mothers milk tea. if he's talking about cluster feeding then offer the boob every 30 min