I wouldn't. I am very aware of my CM and take note of changes so I can determine when I am fertile before I have AF. Follow your baby's lead. Your body knows when she is ready to have a sibling and will resume ovulation at that point whether she is feeding or not.

Having had small age gaps I did find it harder to bf the baby while supervising the toddler so if we have a 4th we wont have a small gap, but we are in the situation that the bigger gap is better for us now.