The Law Code of Yājñavalkya 3.1.29

3.1.29

iti vacanāt | tataś cāyam arthaḥ: nāmakaraṇād arvāṅ nikhananam eva na codakadānādi | tata ūrdhvaṃ yāvat trivarṣaṃ vaikalpikam agnyudakadānam | tataḥ paraṃ yāvad upanayanaṃ tūṣṇīm evāgnyudakadānaṃ niyatam | varṣatrayāt prāg api kṛtacūḍasya | upanayanād ūrdhvaṃ punar āhitāgnyāvṛtā dāhaṃ kṛtvā sarvam aurdhvadehikaṃ kāryam | ayaṃ tu viśeṣaḥ | upanītasya laukikāgninā dāhaḥ kāryaḥ | anāhitāgner gṛhyāgninā dāho yathāsaṃbhavaṃ pātrayojanaṃ ca kāryam || 3.1 || 3.2 ||

according to this statement. And hence this is the meaning: prior to the name-giving ceremony, there is only burial, and no offering of water and the like. After that, up to the third year, the offering of fire and water is optional. Beyond that, up to the sacred thread initiation, the silent offering of fire and water is mandatory. Even prior to three years, [this applies] to one whose tonsure ceremony has been performed. Beyond the sacred thread initiation, however, having performed the cremation according to the procedure for a keeper of sacred fires, the entire funeral rite must be performed. But this is the distinction: for an initiated person, cremation is to be performed with ordinary fire; for one who has not consecrated sacred fires, cremation is with the domestic fire, and the placement of sacrificial implements is to be done as far as possible. || 3.1 || 3.2