Potty Training

I cannot believe that we are already at the potty training stage. Every since Hayden was around 15 months he has been interested in going on the potty, but I didn't push him into it. He would go when he wanted and that was fine. Well for 3 full days now we have big boy underwear all the time. OK well except for nap and bedtime, but other than that. But even during those times for the last few days he has woken up clean diapers, and I am hoping by the end of the weekend we will need no diapers ag all. It makes me sad to know that he is getting so big. I can't believe that he is almost 2 and half. Where has the time gone and can I please have it back.