I agree to first of all put you phone away.
Most of the time I first observe some days. You might see some mums more often then others and their faces become kind of familiar. Then observe which child belongs to which mum and who are in the same class as your child. Then on a certain point just smile and say hi. or ask a question about school (excursion, book week, library whatever) or make a statement (I love the curls in your daughters hair or whatever).
You will see that when you chat other mums will chat as well, the ice is broken and it becomes easier to tell and share.
Published 17th February 2020