The meaning of this sentence can be interpreted as: "solid" is to consolidate stability, "must" is necessary, "early education" is early education, including the cultivation of children's learning, physical and social abilities, "no" is not necessary, and "missing opportunities" is to miss opportunities. Therefore, the whole sentence can be interpreted as: in the critical period of children's development, parents should strive to provide early education and don't miss this important opportunity.
This expression emphasizes the special sensitive period of children in the early stage and has a far-reaching impact on their development. Therefore, parents are encouraged to provide appropriate education and stimulation during this period to promote their children's all-round growth and the development of their learning ability.