Are children obligated to recite the Shema?
Age of Chinuch: A son who has reached the age of Chinuch is obligated in Shema. Some Poskim however rule that even a son who has reached the age of Chinuch, the father is exempt from educating him to recite Kerias Shema and its blessings. Practically, it is proper to follow the first opinion. [Some Poskim rule that once a son has reached the age of 12, the father is obligated to educate him in saying Shema according to all. Once one’s son reaches the age of Chinuch, every father should be careful to personally hear his children recite Shema and its blessings both by night and day and not rely on that they are doing it on their own.]
Definition of age of Chinuch: The age of Chinuch is from the age that the child understands the meaning of the Mitzvah. [This is approximately from age 6-7. Other Poskim rule it is between age 9-10. Practically, it all depends on the child’s maturity.]
If one’s child who has reached the age of Chinuch is sleeping, must he wake him up to say Shema?
 Admur 70/2
 Admur ibid; Michaber 70/2; Mishneh Brachos 20a
 The reason: Although Kerias Shema contains Kabalas Ol Malchus Shamayim, nevertheless, children are exempt from it just as they are exempt from all other Mitzvos. [Admur ibid; Levush 70/2]
 Stam opinion in Admur ibid; 1st opinion in Michaber ibid; Rabbeinu Tam in Tosafus Brachos ibid; Rosh Brachos 3/13
 2nd opinion in Admur ibid; 2nd opinion in Michaber ibid; Rashi Brachos ibid
 The reason: The Sages did not impose on the father to educate a child to recite Shema and its blessings being that the father is not found together with his child during the time of Kerias Shema at night, and by morning the child is still sleeping. [Admur ibid] See Biur Halacha 70/2 “Ketanim Peturim” who questions Admur as to why Admur exempts educating the child in the blessings of Shema, if the blessings may be recited until late. He explains that if the father is exempt from educating the son in the Biblical command of Shema, then certainly he is exempt from Birchas Shema.
 Admur ibid; Michaber ibid
 Bach 70; M”B 70/8
 Chesed Lealafim 70/2; Kaf Hachaim 70/8
 Admur 343/3
 M”B 70/6
 Kesher Gudal 11/1; Shalmei Tzibur
 Kaf Hachaim 70/6
 Or Letziyon 2/45-13; Piskeiy Teshuvos 70/2