The gopis, following the proper system, protected Krsna, their child, with this mantra: May Aja protect Your legs, may Maniman protect Your knees, Yajna Your thighs, Acyuta the upper part of Your waist, and Hayagriva Your abdomen - SB 10.6.22-23

Expressions researched:
"the gopis, following the proper system, protected Krsna, their child, with this mantra" |"May Aja protect Your legs, may Maṇimān protect Your knees, Yajña Your thighs, Acyuta the upper part of Your waist, and Hayagrīva Your abdomen"

SB Canto 10.1 to 10.13

(Śukadeva Gosvāmī informed Mahārāja Parīkṣit that the gopīs, following the proper system, protected Kṛṣṇa, their child, with this mantra.) May Aja protect Your legs, may Maṇimān protect Your knees, Yajña Your thighs, Acyuta the upper part of Your waist, and Hayagrīva Your abdomen.

SB 10.6.22-23, Translation and Purport:

(Śukadeva Gosvāmī informed Mahārāja Parīkṣit that the gopīs, following the proper system, protected Kṛṣṇa, their child, with this mantra.) May Aja protect Your legs, may Maṇimān protect Your knees, Yajña Your thighs, Acyuta the upper part of Your waist, and Hayagrīva Your abdomen. May Keśava protect Your heart, Īśa Your chest, the sun-god Your neck, Viṣṇu Your arms, Urukrama Your face, and Īśvara Your head. May Cakrī protect You from the front; may Śrī Hari, Gadādharī, the carrier of the club, protect You from the back; and may the carrier of the bow, who is known as the enemy of Madhu, and Lord Ajana, the carrier of the sword, protect Your two sides. May Lord Urugāya, the carrier of the conchshell, protect You from all corners; may Upendra protect You from above; may Garuḍa protect You on the ground; and may Lord Haladhara, the Supreme Person, protect You on all sides.

Even in the houses of the cultivators, who were not very advanced in the modern ways of civilization, the ladies used to know how to chant mantras to give protection to children with the help of cow dung and cow urine. This was a simple and practical way to give the greatest protection from the greatest dangers. People should know how to do this, for this is a part of Vedic civilization.