I was lucky DD1 seemed ok with DD2 but we have had times where she gets quite jealous, some things i would maybe try:

1. When feeding or settling get DS1 his own 'special' meal or book etc that he can have at those times ONLY.. it will make him think he has something special.. ask him to read to you and DS2 while you feed.

2. Can you buy him a 'baby' of his own, ask him to 'feed' his baby while you feed, show him how to 'settle' his baby.. i have found DD1 really likes walking her baby and patting it and saying shhh baby it's ok.... she also likes to 'pat' DD2 to sleep.

3. When DS2 is asleep just relax with DS1 but talk about DS2 while you play, mention how DS2 will like to play cars one day, can you show him how to play cars etc etc.

4. I try and involve DD2 in things i like doing with DD1 so if we read a book DD1 picks it and we sit DD2 on my knee, if we play cars DD2 gets a car and the same with dolls or drawing etc... DD2 gets to hold a pencil while DD1 shows her.

It's frustrating when your trying to deal with a clingy or hungry baby and you feel your not giving enough attention to the other child, chances are your giving them PLENTY of time you just don't notice.

Hope someone else has some useful tips for you.