Did you wait 3-4 days between introducing solids?

My son will be 6 months tomorrow and the last couple of days we have offered him pears in which he is not that interested. We put a little bit of the juice from it on his lips and he may have had a suck or two off of a piece as we offered it but that was about it. We are thinking tomorrow that we will try something else and see if he is more interested. But I read that we are supposed to wait 3-4 days between different foods. Is that really necessary or can we try something different just after a couple of days?
 
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