Returning to work full time after 6 months maternity leave

Hi IM's!
I am due to return to work soon after having 6 months off with my 2nd baby. I understand how lucky I am as some mums don't get any real time off with their babies. Our eldest started school this year.

I am returning to work after maternity leave to a full time position. When my partner is unable to look after our baby due to his part time job, my mum has offered. She is moving to our town soon.

With our first born my partner worked full time, I worked part time and daycare was used for about 3 days of the week from the age of 5 months on. We didn't have
my mum then. The roles of my partner and I have completely reversed this time. I have to be the full time worker as its better for us financially and I will have a stable income.

I'm happy that my partner gets to spend more time with our baby this time as with our first child he was working over 50 hours a week! I am also feeling a sense of guilt that I'll be away from our baby working and fear that I am going to miss out on so much! I know that is a little selfish. I guess I'm just thinking about all the wonderful moments I've had with our first born and I want to have those
Moments again as we won't be having anymore kids.

Can I please hear some positive stories from other IM's out there who are/ have been in this position or similar. I really need some support right now to get me feeling better about all this. Please nothing negative as I really need positives!