vallabha-bhaṭṭera - of Vallabha Bhaṭṭa; haya - there is; vātsalya-upāsana - worship as a parent; bāla-gopāla-mantre - with the mantra of Bāla-gopāla, child Kṛṣṇa; teṅho - he; karena - practices; sevana - worship.

Vallabha Bhaṭṭa was accustomed to worshiping the Lord as child Kṛṣṇa. Therefore he had been initiated into the Bāla-gopāla mantra and was thus worshiping the Lord.