In the glorious days, or before the advent of the age of Kali, the brāhmaṇas, the cows, the women, the children and the old men were properly given protection.
1. The protection of the brāhmaṇas maintains the institution of varṇa and āśrama, the most scientific culture for attainment of spiritual life.
2. The protection of cows maintains the most miraculous form of food, i.e., milk for maintaining the finer tissues of the brain for understanding higher aims of life.
3. The protection of women maintains the chastity of society, by which we can get a good generation for peace, tranquillity and progress of life.
4. The protection of children gives the human form of life its best chance to prepare the way of liberty from material bondage. Such protection of children begins from the very day of begetting a child by the purificatory process of garbhādhāna-saṁskāra, the beginning of pure life.
5. The protection of the old men gives them a chance to prepare themselves for better life after death.
(Srimad Bhagavatam-----1:8:5-----purport).

Śrīla Śukadeva Gosvāmī continued: All the gopīs, headed by mother Yaśodā, were bound by maternal affection. After they thus chanted mantras to protect the child, mother Yaśodā gave the child the nipple of her breast to suck and then got Him to lie down on His bed.
(Srimad Bhagavatam-----10:6:30-----purport).

While You are playing, may Lord Govinda protect You from all sides, and when You are sleeping, may Lord Mādhava protect You from all danger; when You are walking, may the Lord of Vaikuṇṭha protect You from falling down; when You are sitting, may Lord Nārāyaṇa give You all protection; and while You are eating, may the Lord of all sacrifices give You all protection.”
Thus mother Yaśodā chanted different names of Viṣṇu to protect child Kṛṣṇa's different bodily parts. Mother Yaśodā was firmly convinced that she should protect her child from different kinds of evil spirits and ghosts—namely Ḍākinīs, Yātudhānīs, Kuṣmāṇḍas, Yakṣas, Rākṣasas, Vināyakas, Koṭarās, Revatīs, Jyeṣṭhās, Pūtanās, Mātṛkās, Unmādas and similar other evil spirits, who cause persons to forget their own existence and give trouble to the life airs and the senses. Sometimes they appear in dreams and cause much perturbation; sometimes they appear as old women and suck the blood of small children. But no such ghosts and evil spirits can remain where there is chanting of the holy name of God. Mother Yaśodā was firmly convinced of the Vedic injunctions about the importance of cows and the holy name of Viṣṇu; therefore she took all shelter in the cows and the name of Viṣṇu just to protect her child Kṛṣṇa.
(Krsna Book).

The elder gopīs of Vṛndāvana were so absorbed in affection for Kṛṣṇa that they wanted to save Him, although there was no need to, for He had already protected Himself. They could not understand that Kṛṣṇa was the Supreme Personality of Godhead playing as a child. After performing the formalities to protect the child, mother Yaśodā took Kṛṣṇa and let Him suck her breast. When the child was protected by viṣṇu-mantra, mother Yaśodā felt that He was safe. In the meantime, all the cowherd men who had gone to Mathurā to pay tax returned home and were struck with wonder at seeing the gigantic dead body of Pūtanā.
(Krsna Book).

Kṛṣṇa and Balarāma were so restless that Their mothers Yaśodā and Rohiṇī would try to protect Them from cows, bulls, monkeys, water, fire and birds while they were executing their household duties. Always being anxious to protect the children and to execute their duties, they were not very tranquil. In a very short time, Kṛṣṇa and Balarāma began to stand up and slightly move on Their legs. When Kṛṣṇa and Balarāma began to walk, other friends of the same age joined Them, and together They gave the highest transcendental pleasure to the gopīs, specifically to mother Yaśodā and Rohiṇī.
(Krsna Book).

Then the gopīs told lotus-eyed Kṛṣṇa, “Please do not discourage our long-cherished desires to have You as our husband. Any intelligent man who cares for his own self-interest reposes all his loving spirit in You. Persons who are simply misled by the external energy, who want to be satisfied by false concepts, try to enjoy themselves apart from You. The so-called husband, friend, son, daughter, father and mother are all simply sources of material misery. No one is made happy in this material world by having a so-called father, mother, husband, son, daughter and friend. Although the father and mother are expected to protect the children, there are many children who are suffering for want of food and shelter. There are many good physicians, but when a patient dies, no physician can revive him. There are many means of protection, but when one is doomed, none of the protective measures can help, and without Your protection the so-called sources of protection simply become sources of continued distress. We therefore appeal to You, dear Lord of all lords: please do not kill our long-cherished desires to have You as our supreme husband.
(Krsna Book).

So according to Vedic civilization, special protection for children, brāhmaṇas, women, and saintly persons, brāhmaṇa comes (under) saintly person, special... And cow. Special protection. Bāla-dvija-suhṛn-mitra. Others, next, just like we chant the mantra: namo brahmaṇya-devāya go-brāhmaṇa-hitāya ca. The first reference is given to the cows and the brāhmaṇas. Why not others? There are so many animals, so many human beings. Why? Go-brāhmaṇa-hitāya ca. This is to be noted. Unless in the society these two creatures are taken care of, that is not human society.
(Lecture on Srimad Bhagavatam-----1:8:49).