You definitely could afford 3 children, a lot of the expenses posters are mentioning are wants versus needs, such as travel, days out, extracurricular activities, university/education expenses and social stuff. So, it then comes down to what you want life to look like and where your priorities lie. No one knows if you can afford the life you want with 3 children.
I have 4, and now they are older, they are SO much more expensive than I could have anticipated. However, a lot of those expenses (like braces, private ADHD assessments/treatment, travel costs, extracurricular activities, high level sport participation, going to friends parties, and additional life and income protection insurances to protect us) are optional. If we had to cut back, we would.
I will say though, that the time is an important point someone has raised. Now 3 of mine are old enough to have their own friends and activities, the juggle is incredibly tough. We have 3 afternoons each week where all 3 finish an activity at the same time across 3 different locations. We often need someone to take one of our children to their sports events, so definitely make sure you build quite a good village around you. We have no family, so it’s often other parents that will help us out. I often feel like I’m not giving any of them the quality time they truly need and deserve.
I’m not saying don’t have number 3, you are clearly set on it, but definitely be realistic that you won’t be able to provide for 3 the same life you will 2. This isn’t all negative, with having no immediate family, I think we were driven to have a big family to hopefully create a larger village for them!