It's so hard to say ! As others have said it takes each child different rate of time to adjust . I have twin dcb who always cry outside , I have just learnt to move on . I don't understand it although I suspect they don't get outside to play a lot .
I will say I had an 13 month who would cry until he would throw up and I tried for a month and termed . Sometimes it's not a fit and sometimes it's just a need to adjust !
Good luck though !!!!