Does Glenn doman's method works? How about heregu or shichida? LO 15mo now

My thoughts of Glenn Doman is that education may be stressful for children. But learning isn't. Education starts from 5 years old, K1 whereas learning starts from birth. So personally I would not use either or the methods and books for my LO. The most crucial time to build up a child's foundation would be from birth to about 6 years old. For me it starts from home and us their parents. I would however consider using the Glen Doman's menthod when my child is slightly older. Just my 2 cents. All the best mummy!