That's tough. A good book to help kids understand the changes with having a new sibling is 'Za Za's Baby Brother' by Lucy Cousins. It has the older sibling a bit frustrated with all the attention the baby gets and how mum & dads are so busy now. It ends with Za Za getting special time with mum and dad once the baby was in bed.
I found my 2 yo DD settled down after about 12 weeks and it all became normal again.
Good luck!
Sticker books worked a great for us. I had a stash next to the breastfeeding couch and dd would cuddle up and we would do them together while I fed ds. I also tried to play with dd whenever I could (like duplo, trains, dress ups etc). It's a short but intense period. Good luck.
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