Introducing siblings to ASD child - how did you do it?

[dev9aug]

DS2 is almost 6 months now and so far pre-verbal DS1(2.8) is doing a good job of ignoring DS2. They have not spent a lot of time together as DS2 suffered from reflux and when he cried, DS1 left the room to go to another part of the house. When DS2 is in the room, we tend not to take too much attention away from DS1 as he feels insecure but also feel guilty that ds2 is not getting enough attention from us. We think now DS2 is crying less, they should really be spending more time with each other, but don't want to rush it in case it makes DS1 more anxious. Hope I am making sense here.

I am looking for your experiences and any advice really, how did you introduce new arrivals and how did it go for you?
Thanks

Hi zzzzz, I have never had a pen pal before.. I like the sound of that. no seriously thanks for your comments, they are much appreciated. Its good to hear about positive experiences like your dd. So far I have only heard good things about siblings on this boards so hoping that it is the same for us as well.

We are trying to get ds1 to help us for eg. When ds2 is in a bouncer etc so he gets used to him being around. DS1 is a pfb so as soon as ds2 starts crying, ds1 gets anxious and we take the little one outside straight away. Just wanted to know if we are doing the right thing?
We have just got ds1 settled and happy so we don't want to upset him but at the same time I realise that we can't shield him forever... Oh the joys of parenting.... I don't know how people manage with 5, we seem to struggle with just 2...