Quoting MummyTo3Beautifuls:" I want 5-6 children, but my family, think im crazy. but I've already got 3/6 of the kiddies I want, ... [snip!] ... enough and my sister who is 29 already has got 7 soo . Sorry if this seems like a pointless topic, just wanted to know "
As long as you can feed all your kids and provide comfortably for them. Depends on your standard of living. If you live in the country and have a farm you can grow your own food and have lots of handmedowns of clothes, toys, etc...you can afford 5+. That's if you have no intention of paying for college and potentially supporting them until they are 25 lets face it, the economy isn't getting better.
You might want to consider how you would support a large family in the event your spouse if they are the sole provider was unable to work. No one's job is secure in this day and age, even if the husband is an engineer or something supporting a large family is a daunting task.
I'm having my second child, I always wanted at least two and know we can support two children growing up and putting them in the things they want to do, etc...helping them thru college if they wish NOT PAYING FOR IT just assisting them, they will have to get a part time job, scholarships, like I did, sorry. Thinking about having a third maybe, so my children can hopefully be together after we are gone and hopefully love/support each other.
In other words, there is no magic number as long as my taxes aren't helping ppl who have no desire to work or better themselves breed.