Unless he has a pattern of really rough nights and days with you and his behavior is showing he needs that second nap then you can't switch back and forth on a parents whim because of a rough patch. It will just complicated thing both at home and at daycare.

That said...I don't think he is getting too much sleep. If anything the large majority of kids get way too little sleep these days. At 14 months he should still be getting a good 13-14hours per 24 hours. 12 hrs at night and a solid 2 hr nap is pretty norm.

My daughter is 20 months and she now sleeps 12hrs at night and 2.5-4hrs in afternoon. this is quite a bit less than what she was getting a month ago (13-14hrs at night and 2-4hrs nap). Anything less and her behavior greatly shows that she is overtired.