I suspect this is something many of you have gone through so hoping to mine the collective wisdom of those who have gone before me!
DD 14 mo has never had an issue with going in her pushchair until recently which happens to coincide with her learning to walk. Now if we go more than a very short distance she wants out and starts crying (more the 'I'm really annoyed about this' shouty type crying than seeming too upset). I of course try to distract her as best I can which sometimes works although I find myself feeding her mini rice cakes to pacify her more often than I would like to admit and I really don't want to regularly distract her from her feelings by offering her food. Yesterday had a nightmare journey with her and made the ultimate rookie mistake of getting her out of the pushchair on the train to try to avoid the condeming looks of those who believe children should never cry in public stop her crying. Didn't really help as the days of her patiently sitting on a lap are looooong gone and she started trying to launch herself out of my arms instead 
If you went through this what helped? Is it just a case of sucking it up till she gets through this phase? I don't think it helps that even though she is not a huge when she has a coat on the straps are pretty much at their limit so maybe she feels too restricted. (side note - is there such a thing as a separate harness you can buy for your pushchair if the straps get too small? Ours is an icandy peach 2)
We do have a manduca carrier which I sometimes use and she tolerates better but this is only recent as I am cackhanded not very good at getting her into it my myself and it's not always practical.
Tia for any tips.