I'm so sorry for your loss
My niece was stillborn 2.5 years ago, and I still think of her daily. Think what could have been, what should have been. Even last night at the checkout at Woolies, I heard them playing a song that was played at her funeral and I teared up. So I can't even imagine what my sister is going through (as it was her child).
I don't think you can put a time limit on grief, I think its more that one day you will realise that you haven't had a cry that day, or that week, or that month. You'll never forget - and you'll always have little reminders that make you upset, but I like those moments as it reminds me that she will always live on in our hearts.
Thinking of you
xxx