Amber, what counts as teaching your child to read? Like yours, my DS started reading when he was aged three. In Tesco, of all places! We thought he'd simply been watching too many adverts
but then discovered he could read lots of unseen texts. I read him storybooks several times a week and he had a toy bus which voiced letter sounds. We also watched Countdown most days! We joke that Richard Whitely taught him to read. Apart from that, I can't think of anything that could be construed as active teaching. My mother said that I taught myself to read too and I really didn't want my DC to learn too young as I was, well, easily distracted for the first three years of school and always in trouble for doing no work.
DS is now much stronger in maths/science than language while the reverse can be said of DD who learned to read with her peers at Primary School. She had the same books and phonics bus, but my return to work meant she missed out on Countdown.