Right I have been there, small skinny ds, just never really ate solids for a looooong time, very worried me. And one day he just started eating, about 15 months old, I didn't do anything different, he just got on with it. (Weirdly he also really liked rice cakes but not with any calories on them, just plain and tiny amounts of other things - half a cherry tomato for one meal etc).
What I did was kept all my wibble worrying inside (or tried), kept serving up family food (spag bog, fish, roast chicken, whatever) because you don't want to get in a rut of them only eating a couple of things. And serve alongside something you know they will eat so fruit, yoghurt, cheese whatever. If he has yoghurt what about spooning in soup, you can add cream to loads of soup plus stick in a potato for some starch. Just keep trying a lot of different meals, different veg, different fruit, he may surprise you one day.
Sorry bakingmum but I have to disagree. I tried limiting my ds's breastfeeding as lots of people including hv advised, and it did not work. He did not eat more solids, he was miserable and when they weighed him he'd lost a tiny bit of weight
. So I went back to feeding on demand. When he started eating solids like a normal toddler he did not decrease the number of milk feeds he was having. This is just my experience obviously but 2-3 feeds was no way enough for him. With breastfeeding you don't know how much they are having so it could just be sips all day that actually don't add up to a huge volume anyway. And its a relationship not just a food source.
Good luck op. Take him to get weighed if you are worried, its better to know what is going on. This is a great book but new edition is not out til next month I think.