When New Zealand Prime Minister Jacinda Ardern returns to Parliament after becoming only the second elected leader in the world to have a baby in office, her daughter will be allowed to cuddle with her during debates and swim in the pool.

Such access, almost nonexistent even a year ago, spotlights a push by many countries to make their parliaments friendlier for children and their parents as legislatures diversify and rules that can be surprisingly hostile to new parents are eased.

"I think we didn't do a good enough job," said Trevor Mallard, the speaker of New Zealand's Parliament, who can be seen from time to time holding infants for members while he oversees heated debate.