Similar happened to me. Hopefully you'll be offered some grief counselling, take advantage of it if you are.
Unfortunately the is nothing that helps it's something you learn to live with over time, I learned to love that bit of pain I feel because it's the only thing left that proves my son was here and how much I still love him, that pain belongs to him.
Other than that you do what you need to cope until you can enjoy a day again.
You could plant some forget-me-nots, or light a special candle every year on his birthday, or celebrate his birthday (we do old school sandwiches crisps etc & cake)
Or all of those things.
There's no correct way to cope with it, and for me the grief is very different to any other because of the other 'new Mum' feelings I was also experiencing mixed in.
I hope you have some supportive people in your life. Remember to communicate to all about what you want/don't want and how you're feeling.
Be patient with yourself, be kind to yourself.
That's the best advice I can give. Thinking of you. Sleep well Theodore James 
