Janelle was born at around 35weeks and 5 1/2lbs...she didn't start tasting solids till 9 months, and that was maybe one baby spoon sized bite a week, she didn't start eating every day till she was 15 months old, and she didn't start eating twice a day till 2... She was small, 12lbs 6 ounces at 6 months old and 15lbs at 18 months old, I don't remember other weights anymore...she's still small though, 34lbs and will be 7 in September, but she is an awesome eater, and she out eats me and has since she weaned at 4.
Travis was born at 38 weeks, so perfectly normal gestation, and 6lbs 14ounces, so perfectly normal size, and ate no solids till 9 months, and didn't start eating every day till 15 months (when he weaned, due to pregnancy I'm sure). He is also tiny, he was 12lbs at 6 months, 14lbs 14ounces at 1, and 16lbs 14ounces at 18 months...he is 20lbs now at 21 months. He's also and awesome eater who out eats me on a regular basis now.
My first son, Kincaid, was born at 39 weeks, 7lbs 7ounces, started solids at 4 months cause he was STARVING and lunging for our food...he ate like 5 meals a day by 6 months old...he was 17lbs at 4 months old!!! Anyway, he is NOT a good eater, and the amount/variety he eats now is only after years of intense feeding therapy.... (ohh, in case it matters, he weaned at 23 months old). He's actually average sized now at 5, 40lbs (which is about 25th%) and 46"(about 75th%), so he didn't stay huge forever.
So, all that to say, I don't think how well they eat/what they eat as babies has much to do with eating issues later in life.
ETA: super baby food suggests that babies usually won't want solids before they weigh a certain amount, I'm pretty sure that amount is 15lbs, and that was very close to true for all 3 of my older kids...
ETAA: solids did not help any of my kids gain weight, Janelle and Travis have been off the charts for weight their whole lives (well, Travis since about 6 months old since he slowly dropped off them from birth). Janelle got on the growth charts for height at 3 1/2, and keeps moving up them, she's around the 15th% now and almost 7...but like I said, not even close to being on it for weight. Travis is 3 plot points below the 3rd% for height and 2 plot points below the 3rd% for weight right now at 21 months....in fact, when starting solids in earnest all 3 of my kids lost weight, cause breast milk has so much more fat and calories. Even Kincaid, who weighed 17lbs on just breastmilk at 4 months old when he started solids only weighed 19lbs at 1...so he gained 2lbs in 8 months.