I just weighed my daughter this morning (we have an infant to toddler scale---same one my pediatrician uses) and she's just barely 20 lb (scale said 19lb15.5oz).
She eats A LOT. Like so much anyone who watches her eat is shocked. Like almost adult sized portions 3-4 times a day. Plus 26ish oz of various kinds of milk. So I don't understand why she weighs so little? She's gained less than 2 pounds in almost 3 months.
She has gotten pretty active recently. Spends all day on the floor crawling, climbing, cruising. Not walking or even standing without support yet. So I'm thinking that's maybe why? But I can't help but be concerned.
We haven't given her any grains and she doesn't get much fruits. What she eats is large portions of vegetables(seasoned and I add either olive or coconut oil to them) plus a protein (usually shredded chicken or ground beef). This morning she had a whole avocado plus a handful of ground beef. So I feel like the food she eats should be fattening her up! It's not low cal food.
ETA: she turns a year old in exactly 2 weeks.
BFP May 2013 - MMC at 8 weeks
BFP September 2013 - MMC at 12 weeks
BFP February 2014 - early loss/CP at 4.5 weeks
BFP May 2014 - MMC/ complete molar pregnancy at 11 weeks
BFP December 2015 - DD born 8/18/2015
BFP November 2016 - pending...

Re: How much does your almost 1YO weigh?
Maybe thats her body type, maybe she can eat a a lot & stay on the thin side. I have always been thin & eat like a fucken pig no lie. DD has 3 meals & about 4 snacks a day. About 2 cups of milk a day. Water throughout the day. She'll be 6 on the 27th & only weighs 44 pounds. Boys have 3 meal 3 bottles snacks 3 times a day & water throughout the day. & they weigh 17 & 18 pounds. I just think my kids are going to have my body type. Im glad i can eat like a dude & be thin. Try not to worry momma.
Will be 1YO on 9/1 and last I checked (maybe a month ago) he weighed about 24 1/2 pounds... he is not walking yet but is NON stop crawling like a speed racer and walking while holding onto furniture. But he was born 9lbs 7oz and has been in the 98th percentile since day one so he is kind of the large side
I always have to remember that they don't need to be concerned about gaining too much weight as long as they are eating healthy types of food. So while I might watch how much rice etc I have, I let her go for it. Veges while good are predominantly low cal. You could make up some vege fritters which would give a lot of energy and protein from the egg.
Their growth also stalls around this age - if they always grew at the same rate they would be flipping massive!
My LO is almost 22lbs and I'm CONSTANTLY being told how chunky she is lol. I feel like she just looks that way because she's short. We've hardly had any weight gain in the last month and a half or so (just went to the dr's a couple weeks ago), which I'm assuming is because she is so much more active now, because she eats like a champ!
Sounds like you are doing everything right, momma, and you have a totally healthy baby