I found it better to socialise with mum's of children of different ages.
Oh God, this. I even prefer to avoid online due date clubs. I love the lack of competition you get with mixed age groups, and the chilled perspective you get from the more experienced parents, esp those who have had several kids.
OP, have a read of this: "The Road to Walking"
www.psych.nyu.edu/adolph/publications/AdolphRobinson-inpress-LearningToWalkPreprint.pdf
It's so interesting. Check out pages 6-14 in particular.
This is interesting too. www.scientificamerican.com/article/crawling-may-be-unnecessary/
Baby books in our culture insist that crawling is some kind of pre-ordained developmental "stage," that is natural/universal like the budding of teeth. In fact, crawling appears to be basically a kind of problem-solving activity that a particular baby may display in a particular environment.
Historically, crawling as an important and prolonged stage is probably quite a recent idea, and if you spend any time in a "traditional" environment you will see why--there are few clean and safe floor spaces to facilitate crawling. Instead, babies are carried in arms/slings etc., and are more likely to be put down in places like nets or hammocks. They are encouraged in walking efforts by mums and other carers who are keen to keep them from sprawling all over the ground for obvious reasons, and tend to go straight to walking in most cases. No evidence it does them any harm.
Even in our culture, many babies do not crawl at all, and those who do crawl crawl in many different styles (described in the above essay as "bear" "inchworm" "army" etc.) Some babies bum shuffle, or even spider crawl on their backs or log roll from place to place!
Why do some babies in our culture go straight to walking? Nobody knows why but it is probably an intersection of personality and living environment. Some babies enjoy the interactive element of being "walked" and demand this a lot, leading to earlier walking--other babies like crawling because they can do it all by themselves, and if they like crawling they may walk later. Some floor surfaces make crawling easier, some make walking easier. Having furniture disposed in a way that makes cruising easier may encourage cruising and then walking, rather than crawling. Some babies may prefer to cruise, then walk, because they want to hold on to a favorite toy, or "give" toys to a caregiver.
There is zero evidence that skipping crawling has anything to do with developmental issues.