WOW you are getting a hard time on here @willywallaby I don't know why. You are entitled to not want people touching your baby's pram/pushchair and forcing unsolicited 'help' on you. People should ask if you need help, not just force it on you!
I was pulling a suitcase on wheels from the train station to the bus stop once, and a man GRABBED it off me, and said 'that is far too heavy for a lady to pull!' I was 30-something, not 103! I said 'excuse me, give that back to me.' He said 'don't be silly, I will take it where you want, where are you going?' I GRABBED it back, and glared at him.' He was like 'WOAH!'
I just thought 'seriously mate, really?!' 
And also one time several years ago, I was walking through a large churchyard as a shortcut to meet my friend, and 3 blokes shouted to me that my backpack was half open, and one of them ran up to me, and started to yank it off my back, to 'zip it up for me.' I pushed him away, and said 'stop it please! I can fasten it myself!' He was like
I thought 'just fuck off, I don't need you pulling my backpack off me.' For all I know he might have run off with it.
As it happened, when I checked (after I left the churchyard, it wasn't open after all! (Well, maybe 3" open - that's it!)
Unless I ask for 'help' just fuck off please. Same as people offering me lifts when I'm on a walk trying to get my steps up, and when I politely decline, they're like
... Like I just shit in their mouth or something.
YANBU and have done nothing wrong @willywallaby . Don't take the responses on here to heart. Some people just love to bash and berate!!! There are some ridiculous OTT responses to you on this thread, and bloody rude. The irony! 😆