Just as you are enjoying the pleasure of your spouse or partner, your little one walks in!! Oh S#%&t!!!!!! Who has been there?
Don't panic! Sex Happens! Don't feel embarrassed! Sex Happens!
It is normal to still want and desire physical intimacy after children. How else do you explain siblings? The babies happened at some point. Interestingly, many shy away from having sex out of fear that they will get caught in the act. I can remember the horror of walking in on my parents. My mother shouted out, "CLOSE THE DOOR!" and we ran back to our rooms. We didn't say anything else about it.