Christine,
The 45 minute nap days can be hard, but can tell you it is not unlikely for a lo to have a routine that looks something like this.
E A S A E S A etc etc.
If he does have a short nap in the morning and a longer one in the afternoon, I cannot see it being a problem, just ensure he does still have all his feedings to ensure you don't have any night wakings.
HTH
Paula x