18 month old started tip toe walking

[OLR92]

My DS has just turned 18 months old. He learnt to walk quite early at around 10 months and is now very confident. Has always walked flat footed and can run, walk and jump with little to no bumps. Recently, however, I have noticed he will occasionally turn to walking on his tip toes both barefoot and when in shoes. He can walk flat footed but walks on top toes 30% of the time.
Sometimes knowledge is a dangerous thing and I know this can be a red flag for ASD as well as other things. Im not overly concerned about his other milestones. He seems to be developing speech a little late but does have a good solid 20 words he uses.
Just wanting some feedback / hand hold!

Is this okay or should I be ringing my HV?

I think it's definitely worth speaking to the HV. Even if it's just for reassurance. Maybe you could ask her to do the 18 month Ages & Stages?

Hi how’s your son now ? ☺️

Hi, he’s now a running, walking, bike mad almost 3 year old with no tip toe walking in sight. It was a phase, I think he learnt how to do it and was experimenting. His speech is now way ahead and came all at once, it’s like he swallowed a dictionary overnight.

Sometimes we worry so much in the moment but they all make progress in their own time 😊

How long has he been doing this? And when did he stop doing it?