The singer has never disclosed whether she has a son or daughter.
A quarter of nursery workers say they have seen a rise in the number of children biting in the past five years.
Sadfishing is when someone posts about an emotional problem in an attempt to attract attention or sympathy from followers.
The warning comes stats reveal the uptake of all 13 routine childhood vaccines has fallen in the last 12 months.
Vegan campaigners are calling for the government to include plant-based milk alternatives.