Erections and condoms

Hi there, new member here trying out the free trial and figured id come straight out with my current issue. My fiancee and i recently had our first baby, about 6-7 weeks ago now.

There was obviously a gap in our sex life over that period as she was too sore etc. Now weโ€™re back at it, we need to use condoms as we dont plan on having another child, but i find they seriously affect my performance.

I can get erect to put the condom on and stuff and start sex fine, but as soon as the actual sex stops for a second to change position or reinsert i immediately lose the erection and trying to get up again with a condom is difficult for me. Do you guys think the condom is the issue or is something else going on? Our sex life is still amazing and she doesnโ€™t complain or anything, its just very awkward for me going from full sexual energy to trying to make it work again with a tight uncomfortable condom.