my girl is also 17 months.
at 8 months old, she weighed 21 lbs.
at 15 months, she weighed 22 lbs.
she's always been top of the charts in height and head circumference. but she slowed way down in the weight dept and just got taller, and her head got bigger. However, I weighed her a couple weeks ago and she now
weighs 26 lbs!
For the longest time she really only wanted milk and fruit and yucky gerber graduate snacks, which I fed her, since that's all she liked. Now she eats really well, I am so psyched. When I was very concerned about it, I asked the dr. who told me that as long as the head is growing, its not a big deal. the brain needs lots and lots of calories, and so mostly all of my girls were going to her brain. One thing that helped us get the girl to at least try to eat, was giving her lots of different foods. Shredded cheese is a good one, high in calories and protein, grapes are a fave, scrambled eggs, mac & cheese (there is a Simply Organic mac and cheese that even I find edible), spaghetti, really fun to eat stuff, thats what I look for. I've bought campbells' chicken noodle soup just because it had gold fish shaped pasta in it. my girl gets really psyched about stuff like that.
but my dr said to me, she knows what she needs. keep offering, but dont freak. 20-22 lbs is not dangerous. dehydration is dangerous, so is vitamin deficiency...but your bebe sounds like she'll come around when she's ready.