DS2 is now 15 months. He does all the right things - pulling himself along furniture, climbing onto furniture, standing without support, pushing his baby walker along.
He has done one or two steps a few times, but that's it... usually he just drops dramatically on his knees 
. He will when he is in the mood happily walk on my hand, even quite some long distances. But he won't, for the life of it, walk independently!
Now I don't doubt that he will walk eventually, and I am truly not worried about his physical development, there is absolutely nothing wrong with him. However, we need to drop off his bigger brother at school every morning, and that school is up some steep steps. Currently I am navigating this with DS2 in a back carrier, but he is getting heavy!
Any ideas on how I can encourage things along? He got a nice Christmas gift that makes music, and when I say "dance", he will go on his feet, stand up, and wiggle about... but he just won't walk.
It's also strange as DS2 was born full term (well, 39 weeks). DS1 was slightly premature at 36 weeks and walked at a year old!