Hello, another mummy of 3 here, all girls aged 5, 3 (turining 4 next weekend) and 4 months.
Have to say I felt the same in the begining with respect to giving them enough time. But now not a problem. I am also EBF and to be honest I find that it fits in easier than having to prepare bottles etc. If I am doing something with the older girls and baby needs a feed I just pop her on and carry on doing what we were doing one handed (mainly reading at the moment as both girls are big into books and DD1 has started reading properly & loving it).
I express when I am able to, which isn't very often as baby is rather demanding and prefers boobie to bottle. But we have also given her the odd formula feed, this was mainly to get the kids involved. DD1 loved doing it, had baby on her lap and even burped her afterwards, DD2 was happy to hold the bottle whilst I held baby, but got bored rather quickly, told me she doesn't want to be a mummy when she grows up and cleared off to play with her toys
- we didn't formula feed till she was 3 1/2 months though as she refused to take anything from a bottle at all till then.
Also throwing a party next weekend for DD2 and all her cousins and some pre-school friends (total of about 45 kids, but am hiring a magician as DH will be working, and no way Im gonna try to amuse 45 kids for 2 hours!!!)
It's normal to feel guilty, I felt very guilty when DD2 arrived as DD1 was only 16 months and I felt like I had cheated her out of her mummy & daddy to herself years. But the guilt passed quickly, and was hardly there with DD3.
With regards to bedtime, I sometimes sit either in my bed, or one of the kids beds with baby on the boob - even if she's already fed as she is begining to teeth so is sucking a lot for comfort - and read a book with me and the 3 girls snuggled up together. I love that time of the evening. It's not every night as that just doesn't work.
I hope you find it easier soon. Just remember that parenthood is just one big guilt trip for the parents, my mum always used to tell me that and I would just look at her and think 'what are you talking about', but now I understand!
I found my girls were much more accepting of the baby once she began smiling at them and interacting with them, they now spend ages all three of them giggling at each other which is adorable!
I hope the party went well today xx