I have 22m DS who in my opinion (from other kids i have actually met) seems about average.
He has quuite a few words, increasing everyday, understandable to us but not necessarily clear yet to others, not yet speaking in sentances, knows all colours if you ask him to point to them but can only say yellow and blue, can recognise all numbers 0 to 9 if you ask him to point to them but can't count. Loves playing with his shape sorters, drum, toy garage and listening to his nursery rhymes. He is a real daredevil, will climb very high slides and climbing frames. Typical nearly 2 year old i would say.
Then when i read mumsnet i'm reading that nearly 2 year olds can do 50 piece jigsaws, read sentences, ride bikes and the replies to those posts say that is all perfectly normal. Are these things really normal and is my boy backward or are they advanced (but within the normal spectrum) and the posters don't want to swell the OP head