http://ufamama.org/detskaya_psihologiya/osobennosti_psihicheskogo_razvitiya_detej_do_1go_goda/razvitie_detej_v_vozraste_3_4_mesyaca/
Развитие детей в возрасте 3 -4 месяца
http://ufamama.org/detskaya_psihologiya/osobennosti_psihicheskogo_razvitiya_detej_do_1go_goda/razvitie_detej_v_vozraste_3_4_mesyaca/