I agree hun. Each child is so different. My eldest, who was a prem baby and is now nearly 13 years old (where did the time go??!) I commenced weaning at 13 weeks as she was so hungry - this was on the advice of the HV and she did great. That all changed though.
My toddler I began to wean at 17 weeks and she's also done absolutely fine and dandy and continued to be a great sleeper but this little 'un is having none of it. She loves the food, doesn't seem to have a problem with eating but boy, she needs some attention overnight too. My pattern is a midnight, 2am, 4am type feed session which I need to break (and am working on with lots of lovely ladies help in another thread).
Good luck hun! x