Congratulations on your new little one. Like you, I breastfed my first child with relative ease but found it a tough experience. My second is now three months old and I have had much more pain and many more difficulties breastfeeding. It made what should've been a lovely (albeit hard) period of time into an awfully depressing and worrying time for me and others involved. Having fed number one until well after she was weaned, I realised that, to try to do this with my second was going to compromise the health and happiness of my family. It was especially heartwrenching to make my first child go through hours of me trying to deal with number 2 crying and feeding and then me hoping a nap would come and then feeding again and promising to go out but then needing to feed again. I honestly do not know how DC1 coped with it. So, at 11 weeks, I swapped to formula.
DS is 13 weeks now, I breastfeed him once in the morning, at bedtime and overnight. So, from someone who has had a similar experience as yourself, here are the pros and cons of choosing to combine/give up breastfeeding (all personal thoughts with no research behind them):
Cons
If you had hoped to breastfeed, it is hard to give or to see someone give that first, second, third bottle
It's very tough going against the grain, especially if you have managed it the first time around
You have an extra job - washing and sterilising bottles
You have to put a bit more thought into going out - don't forget the bottles, mummy!
You will never know if breastfeeding will have become easier for you
I didn't appreciate how true it is that you have a hand free when breastfeeding whereas you really really can't help your toddler do anything when you have a baby in one hand and a bottle in the other
My first got chicken pox when my second was still being EBF and he didn't get it which was a relief as he was only about 8 weeks old
Pros
My baby is definitely more content and I no longer feel as though I'm sinking and taking everyone else with me
I am not forcing my older child to share the pain and misery that I tried to hide while breastfeeding but know that she picked up on
It's a privilege to feed a baby and my DH and DD can take part in it now (obviously EBF babies can be fed too with expressed milk)
There is no pain - I described breastfeeding as more painful than labour
There is now time in the day for DC1 to chat and 'play' with DC2 - it is lovely
I have breastfed both my children and so have you
So, at the end of the day, the decision is yours. As a family, we haven't really looked back. As a mum, I'm so much more relaxed but I do wonder if I could've kept going for a day/week/month more.
Good luck and congratulations again!