Should we observe vriddhi theetu (taint on account of a birth) like taint due to death or can it be observed leniently like visiting relatives to celebrate the birth, eating sweets, applying vermillion, and accepting betel nuts?

Certain exceptions are followed during vriddhi theetu as per tradition. There is no need to visit others’ houses because while observing a taint, the focus should be on the observance; only when there is an absolute need to go out, one can go out but maintain a distance. There is no restriction in applying vermillion and eating sweets but taking betel nut does not seem to be in practice.