I heaps of stuff away after dd's first a second birthdays. Alot was too old for her. I've still got a whole heap of stuff put away from her first birthday that I pull out here and there.
There was no reason for her to have over 100 gifts to play with straight away on her 1st birthday!! We did get a couple of double ups as well, do I took them back and exchanged them for other things.
I do have a trike here from dd's 1st birthday that we are going to put under the wishing tree this year, it's been sitting in the spare room for over a year and a half, and she already has a trike + spare ride on for friends.
I don't see a problem with spreading them out, or even re-gifting/giving to charity.