Hi all. This is my first post - please be kind
I have DD13 from previous relationship and have been with DP for almost 5 years now. He has DSS13 and DSD11. We both had our kids in our early 20s and are now mid 30s and wanting a child of our own. Neither of our previous children were planned and we both went through the experience of separating from the other parent when the kids were young. I always say to DP that I'd love to know what it feels like to have a baby and raise that baby together with someone rather than co parenting separately. He wasn't overly keen on us having our own at first but after about 3 years of on/off discussions, we're now at a point where he wants to have our own and even at times looks almost excited about it. Another aspect to me wanting this for so long is my panic at the thought of having an adult daughter in 4 years time at the mere age of 39! I don't feel ready for that - I feel I should still be mummy to little ones too!
My question is ... have any of you done similar and had another little one when your existing child / children were in their teens? Pros and cons? Would you recommend? The first pro I can think of is that my DD is ridiculously excited about it (as 13/14 year old girls are) and has already offered her babysitting services 
. She'd be an excellent help and great big sister, so I feel the age gap in that respect might actually be an advantage?
Any thoughts welcomed 