kṛmayaḥ kṛmikaṁ yathā
The word vigata jñānam means that the spiritual knowledge which the child developed in the abdomen is already lost to the spell of māyā. Owing to various kinds of disturbances and to being out of the abdomen, the child cannot remember what he was thinking of for his salvation. It is assumed that even if a person acquires some spiritually uplifting knowledge, circumstantially he is prone to forget it. Not only children but also elderly persons should be very careful to protect their sense of Kṛṣṇa consciousness and avoid unfavorable circumstances so that they may not forget their prime duty.