DS1 was born Nov 06 & DS2 Dec 08. DS1 didn't walk until 18 months & still seemed like a baby to me, I can remember one day saying to him "come up here on my knee & we'll have a cuddle & watch Balamory" and then I felt really sad thinking that I wouldn't be able to do that anymore once the second one came along and took up all my attention. But I can only echo the things other people have said and it wasn't as bad as I thought it would be.
Thing I found the most was how much more relaxed I was about DS2, with DS1 I was always anxious, always worried I wasn't doing things right, how much he ate, how much he slept, that he wasn't walking, that he couldn't talk as well as other children his age - I mean absolutely everything. DS2 didn't take up that much of attention & DS1 still got lots of time with me.
But also really agree with strandednomore that it was harder once DS2 started getting about more & pinching his brothers toys. They are 4 & 2 now and I do find it hard to give either of them any one to one time but we do go to lots of playgroups, softplay sessions etc. They do fight a lot but also love each other & play together a lot too (sometimes a bit too rough!) There is 18 months between me & my sister and we couldn't be in the same room together for more than 10 mins & we would be fighting, must have driven my mother mad - knows how she feels now! But we were also incredibly close & still are.
I would also agree to leave the potty training until DC2 has come along.
MrsMichic 25months between my two & I can honestly say we had no problem with jealousy but I think this is down to DS1's personality & also the fact that he wasn't that interested in his little brother, again wasn't until he was getting about more that he became more of a pain in the arse interesting to him & a bit harder to ignore!