My Ds4 loves LOVES flashcards! Everytime we see any he wants them. I don't see a problem with flashcards themselves - it's the way they are used i think is the real issue. If you go through them 'flash carding' a child forcing them to learn/answer - that is an issue. But if they are around and kid asks whats this?/ can you show me this? then thats different. JMO

DS4 started counting cup coasters at 10m. We would go to MILs on a Saturday, he would line them up and point at them in turn, some one must have said 1,2,3 and he repeated. One time he put out 4 and counted on-oo-ee then pointed at the 4th and looked at someone seemingly waiting for an answer.

My DD almost 2, can count 1-13 (misses 12) in English and 1-6 in Spanish. But if you asked her to bring 3 objects to you she can't (or won't?). She also counts in 10s to 40 but thats memorized from hearing her brother say it over and over and over!! grin