Because of drinking the breast milk of their mother, the nine sons of Āgnīdhra naturally had strong, well-built bodies. Their father gave them each a kingdom in a different part of Jambūdvīpa. The kingdoms were named according to the names of the sons. Thus the sons of Āgnīdhra ruled the kingdoms they received from their father.
The ācāryas specifically mention that in this verse the words mātuḥ anugrahāt ("by the mercy of their mother") refer to the breast milk of their mother. In India it is a common belief that if a baby is fed his mother's milk for at least six months, his body will be very strong. Besides that, it is mentioned herein that all the sons of Āgnīdhra were endowed with the nature of their mother. Bhagavad-gītā (1.40) also declares, strīṣu duṣṭāsu vārṣṇeya jāyate varṇa-saṅkaraḥ: when women are polluted, varṇa-saṅkara, unqualified children, are generated, and when the varṇa-saṅkara population increases, the entire world becomes hellish. Therefore, according to Manu-saṁhitā, a woman needs a great deal of protection in order to remain pure and chaste so that her children can be fully engaged for the benefit of human society.

(Srimad Bhagavatam--------5:2:21--------translation and purport).

The great sage Maitreya continued: The instruction of Dhruva Mahārāja's mother, Sunīti, was actually meant for fulfilling his desired objective. Therefore, after deliberate consideration and with intelligence and fixed determination, he left his father's house.
Both the mother and the son were lamenting Dhruva Mahārāja's having been insulted by his stepmother and his father's not having taken any step on this issue. But mere lamentation is useless—one should find out the means to mitigate one's lamentation. Thus both mother and son decided to take shelter of the lotus feet of the Lord because that is the only solution to all material problems. It is indicated in this connection that Dhruva Mahārāja left his father's capital city to go to a secluded place to search out the Supreme Personality of Godhead. It is the instruction of Prahlāda Mahārāja also that if one is seeking peace of mind he should free himself from all contamination of family life and take shelter of the Supreme Godhead by going to the forest. To the Gauḍīya Vaiṣṇava this forest is the forest of Vṛndā, or Vṛndāvana. If one takes shelter of Vṛndāvana under Vṛndāvaneśvarī, Śrīmatī Rādhārāṇī, certainly all the problems of his life are solved very easily.

(Srimad Bhagavatam--------4:8:24--------translation and purport).

Foolish people do not know that every individual soul is responsible for his own actions and reactions in life. As long as a living entity in the form of a child or boy is innocent, it is the duty of the father and mother to lead him into a proper understanding of the values of life. When a child is grown, it should be left up to him to execute the duties of life properly. The parent, after his death, cannot help his child. A father may leave some estate for his children's immediate help, but he should not be overly absorbed in thoughts of how his family will survive after his death. This is the disease of the conditioned soul. Not only does he commit sinful activities for his own sense gratification, but he accumulates great wealth to leave behind so that his children may also gorgeously arrange for sense gratification.

(Srimad Bhagavatam--------4:28:22--------purport).

To surrender to Krsna means to surrender to His devotees also, for no one can be a proper servant of Krsna unless he is a proper servant of a devotee. Chadiya vaisnava-seva nistara payeche keba: without serving a servant of Krsna, one cannot be elevated to being a servant of Krsna Himself. Therefore mother Parvati spoke to Citraketu exactly like a mother who says to her naughty child, "My dear child, I am punishing you so that you won't do anything like this again." This tendency of a mother to punish her child is found even in mother Yasoda, who became the mother of the Supreme Personality of Godhead. Mother Yasoda punished Krsna by binding Him and showing Him a stick. Thus it is the duty of a mother to chastise her beloved son, even in the case of the Supreme Lord. It is to be understood that mother Durga was justified in punishing Citraketu. This punishment was a boon to Citraketu because after taking birth as the demon Vrtrasura, he was promoted directly to Vaikuntha.

(Srimad Bhagavatam--------6:17:15--------purport).