Hi Eugenie, Just on to offer support and agree with other posters. DD1 was 19mo when DD2 arrived, 4 months later it is getting much easier I find. The days when DP are home seem to be the most chaotic, why is that
When possible get outside, I tend to visit lots of people, basically forcing them to help me entertain the kids!
Cbeebies/DVDS/Sticker books (This has been a particular lifesaver) for feeding times.
Keep DC1 involved. DD1 is a happy helper, but if I ask for help and she says no I just leave her to it.
When DC2 starts smiling/laughing etc tell DC1 that they were smiling at them, makes them feel good and chances are it's actually true. DD2's biggest smiles are for her sister.
Lots of play time on the floor, DD1 and I play blocks/dolls etc and DD2 is happy lying watching and is now rolling which I believe is because she is desperate to play with her sister.
Try and get a loose routine reinstated if you had one before. We are slowly getting back to a routine bath/book/bed etc but it is taking much longer than before but DD1 still knows what is expected.
Just enjoy it, let the standards slip, don't apologise to visitors for the washing/ironing everywhere. Let people do things for you if they offer.
And for DC1, plenty of time, don't force any issues, it is a huge change but he will get used to it and before long he'll not remember a time without the baby! I have 3 younger siblings and can honestly not recall a time when we weren't all there. Their bond will be incredible given time. :D
FWIW, my sister kids have a 6 year age gap and as much as they love each other I would not trade our age gaps for the world!