New here. Hello and advice please

Diana
Hi all. I'm hoping for some insight into what my body is doing. I'm 41, 42 in a few months. I have a 2 year old and would love another one. For 13 months after my baby was born I didn't have a period. I wasn't surprised as I was breast feeding on demand. It's been just over a year since I got my first post delivery period and it's still not returned to normal. What I mean is that they are lighter (I pretty much no longer have heavy period days) and are irregular. I have gone for an average cycle length of 30days to anything from 24 to 40 days. What is going on???? I still breast feed my toddler but just once at night. Surely that cannot be causing this? Is this the onset of menopause? Is it normal for one's period to become so much lighter and so irregular two years post delivery? I would love a sibling for my kid so I need my cycle to.... I just need to know what is going on. Can anyone shed any light. Many thanks.