Hiya
Congratualtions on your pg so far and I wish you all the very best for the tough times ahead, whatever you decide! The following is just my opinion, the final decision is yours and your partner's obviously.. but I figured the more opinions you have the better!
I'd keep all three. I'm older than you (35) and to have three more kids now would be fab for me!
Here are a few of the pros, and a few solutions to problems, in my eyes anyway
You'd basically have all the kids you'd want! Yes, it would be tough at first.. but as they got older and went to school etc, you'd be pretty much free to do what you want to with your life.. without the concern of taking time out from a career later for more kids, or the worry of how your existing kids would get on with a new baby, or whether it was the right time for another and so on. You'd also get all the sleepless nights out the way in one go, and the toilet training, and the tantrums
Plus, 3 kids (4 including your oldest) are easier to entertain than one. I have 4 younger brothers and a younger sister, and all five were under 5 years old at one point. There's definite bonuses to having ready made playmates, from both the parents and the kids point of view!
Moneywise, you'd get help
Three more lots of child benefit, regardless of anything else. Buying in bulk is always a better price, and as has been said you wouldn't necessarily need 3 of everything. Plus, yu may find that local stores might give a discount? I'd definitely ask... for instance.. it'd be great publicity for your local Mothercare or whatever to be in the local paper having donated a triple buggy to your worthy cause? I appreciate you might not want to be a local celebrity, lol.. but with naturally conceived trips, you might find yourself in the paper anyway so why not make the most of it!
In my experience, people will rally round too. I have no idea about your family situation, friends etc.. but with a toddler you must know a few local mums, and mums tend to stick together
Whether it's offering you some practical help, or passing on unwanted clothes etc.. people are usually keen to help.
I know these are more practical considerations, for after you have the babies rather than advice on your situation right now, but it's definitely worth considering that although it'll be tough.. it'll be massively rewarding
I really hope that and your OH make the right decision for you
As I said at the start of my mammoth post (lol) these are just my opinions and ideas on how I'd cope.. but everyone is different and no one will think badly of you if you opt for a selective termination. It's all about you, OH, your toddler.. and how many babies you can cope with!
We're all here for you and will support you whatever you decide
xxxx