Re: Almost 20 months old, overweight? Still nursing daily..
My DD2 is 2.5 years old, 39 inches, and 35 lbs. She's a big girl, but also an extraordinarily tall girl. When the height and weight percentiles are at the same end of the charts, there's much less reason to worry about a kid's weight- and it sounds like your kid has been matchy-matchy that way right along.
One thing I have noticed with both my kids is that they will chub up right before hitting a major growth spurt. One day they're looking a little pudgy, and the next week all their pants are too short! It may be that your LO went in and got measured right in that chubby window before a height spurt.
If you're ready to wean, that's fine. But don't wean out of fear that nursing just 3x per day is making your kid fat! I don't think that's near enough nursing to cause a huge weight gain. And nursing is a perfect form of nutrition (way better than hot dogs and pasta!), it's so good for your toddler's immune system, and it's a great mothering tool. I had to take my 2.5 year-old in to the ER last night at 3 am. She's fine, but I don't know how I would have made it through the night without being able to comfort her with nursing.
I think that if you're concerned about your kid's weight, the best thing to do is to run him around more, make sure he eats his veggies, try to reduce the amount of fat and simple carbs in his solid food diet. Chicken breast instead of hot dogs. Whole wheat pasta instead of white pasta. Which is not my way of trying to blame you for your kid being on the big side! I know for a fact that you can feed your kid a great diet and have them exercise all the time, and still have them be on the bigger side!
ETA: Tracie nailed it, as usual. When you have a big baby, it's all "WTG, keep nursing!". But the moment you have a toddler or child who's on the larger side, it's all and "Hey, have you heard about the epidemic of childhood obesity?". Can't win for losing!
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"