Hi my ds started this at 11 months. He can still be funny at 2.5. I used to do the yogurt thing when at my wits end. My health visitor wasnt concerned she took the same view as mishy moos gp.
I found that sometimes giving him a yogurt while his dinner was still in front of him then got him picking at his dinner. I know its not ideal but it doesnt seem to have become a permanent thing.
I found the bigger deal I made of it the less likely he was to eat. Sometimes if I just ignored him he would start munching. We had some real battles with both ending in tears at times, with me it was the worry he would starve or become under weight but he never did. Annabel Karmels book has a really good section on fussy eating helped me chill out.
My HV said with new stuff that sometimes it can take 15 occasions of putting something in front of them to get them to try it.
I found one thing that I could tend to get my ds to eat was a mushed up baked potatoe, cheese and beans. We used to joke he would live on it if he could.
He does still seem to have what we call his eating days and non eating days. But I was told its what he eats over a period of days that matters.
I have found with my ds that little and often throughout the day worked really well rather than bigger meals.
Sorry I know this was a long one, hope I didnt ramble too much.