Retired speech and language therapist here. I used to see a lot of infants with queries over some aspect of development (obviously involving communication, in view of my profession). The mean age for walking is 13 months, some children walk at 9 months, some not until 21 months. 22 months is quite late. The usual guidelines for referral to Paediatrics for late walking was 18 months, by which time the vast majority of children are on their feet and can take at least a few steps independently. The reasons for late walking are many: heavy child; general developmental delay; motor issues such as dyspraxia, dysarthria or dystonia. There are some rarer genetic and metabolic developmental conditions which cause motor delay. I would always refer to Paeds if the child was not walking at 18 months, whilst advising the parents that this might just be something which sorted itself out while they were awaiting their appointment with the consultant, but to nevertheless go and have things checked out. Just a personal note, my mum said I never crawled, but bum-shuffled. I walked at 13 months, but, Like M0nica, I am dyspraxic.