I am married and we recently had a kid. He is now 9 months old. I applied alone and marked my spouse and kid as non accompanying. While submitting the application, I was asked for the reason why my family is not accompanying me to Canada. I clearly stated that my kid is only 9 months old and he could find it quite difficult to get acclimatised to a new place at such a young age. I got my PR visa last week and planning to land during August or September.
Please note that even though your family is not accompanying you, they still need to undergo medicals and you still need to submit the PCC for all the adults. So I would personally advise you to include the family unless you have a strong enough reason like in my case. Again the decision to include or not will not, in any way, impact your application.
The CRS score anyways has dropped to 415 in the last draw.
So think about it and decide.