Bill Tan, yes, your comment on crawling is a good point.. LINK
According to experts, more kids seem to be hitting numerous motor
(movement) development milestones later or skipping them altogether.
The topic is increasingly becoming controversial in the medical
community. While the conventional wisdom is that there's no harm in
skipping the crawling stage, a growing number of experts --
particularly pediatric occupational therapists -- say that crawling
is actually a critical developmental milestone whose long-term
benefits we're only now beginning to recognize.
I think your child is well within the normal range for walking. If you are concerned and have not discussed it with your doctor then ask. Children develop at different rates and unless your doctor is concerned, I think it's fine.
I was thinking about crawling and why it is important. IMO, it is as important as walking. LINK Why crawling is important
Building the core muscles and the muscles of the arms and legs makes crossing the midline easier for children. There's even a link to Attention Deficit Disorders, when children have problems with it.
LINK Why crossing the midline is important