It's a bit weird having lots of children in this day and age. As there is such a huge population of humans - 8 billion now - I can't see the need. The parents cannot POSSIBLY give each child their full attention when they have 6 or more children. Also, I do wonder if people would have so many if they had zero help from welfare benefits? Not even child benefit...
1 is fine, 2 is plenty, 3 is the most anyone needs IMO. It would do the planet the world of good if 50% of humans didn't reproduce at all for 10 years. Also, whilst children are wonderful, and SOMEone needs to have them to keep the human race going, it is hard work raising them - and expensive. And even when they're grown they cause you heartache and stress!
I know a woman right now with a 36 y.o. daughter who has just moved back 'home' for the third time. (First left at 28!) She gave up her job and her flat - as all the responsibility was 'stressing her out.' She hasn't kept a job for more than 6 months, she's had 13 jobs since she left school, and has spent more than 50% of the past 17 years unemployed. Her mother enables her too. (This 36 y.o. woman has had a couple of boyfriends, one for 1 year, and one for 2 years, but never lived with any of them!)
I'd lose my shit if either of mine behaved like this. Her other daughter (age 30) has had 2 children with different men, and lives at 'home' too. With the 2 children. Had 7 different jobs between 17 and 23, and has just not worked since she had her first child. All living off the parents!
YANBU @User788889 Fortunately however, not that many people have lots of children these days, and more people than ever before are choosing to remain child-free.