My eldest was 3 years 2 months when baby no 3 arrived in January. So I now have a 3.5 year old, 2 year old (just) and 4 month old. I echo what SunnySue has said it is hard. Theres never a spare moment but I am however on my own with no support. My eldest two are the best of friends and usually play quite well together while I am feeding and settling baby. Don't get me wrong there are times when I am breastfeeding baby, wiping one toddlers bum and stopping other toddler drawing with crayons on my carpet all at the same time! I call this the mad house.
Unfortunately for me it has caused very bad PND and anxiety. You need a lot of support with 3!
Are you expecting again Sarahlouise?