If you have a two, three or four year old you know, no speech, no social interaction, I can't emphasize enough: Don't wait, you need at least 20 hours a week of one-to-one teaching.
２～４歳の子で 何も話さず 社会性も無い場合 今すぐに 最低週２０時間の マン・ツー・マンの指導を始める事です