I went back FT when DD was 9 months a year ago. It was tough as I'd moved jobs and was more senior but was getting little sleep as DH was away a lot and anyway she would scream for me hysterically if he went. Things improved a lot when we managed to get her to sleep better when she got a little older.
I also followed the "don't complain, don't explain" mantra. Which for me meant keeping children issues out of earshot of my boss, my peers, my clients and my reports to avoid being labelled as "mummy track" which I've seen happen with others if they are perceived as being focussed on their children most ML. I never talked about tiredness, being up constantly in the night, the terrible headaches from being chronically exhausted when I was getting no sleep. I didn't discuss childcare headaches, getting covered in sick when walking out the door, worries about DD's health. If someone asked how she was I'd happily talk about her and if they expressly asked show a photo on my phone and would mention what we'd done with her if someone asked about my weekend or whatever but didn't anchor my personal work discussions around her.
We have a nanny which cut down the childcare issues substantially but I never apologised to anyone for leaving at a fixed time in the evenings when work allowed. I would mention it in passing when DH took time off work to look after DD. On the odd occasion where I cracked and got in a bit late having had no real sleep until 6am I would just block my diary marking it personal and no one would ask questions.
I regularly work evenings and weekends and would make a point, where appropriate, of emailing colleagues and clients during those times so they knew I was working. I tended to work one evening late in the office most weeks to clear backlogs. I delegate as much as possible within the team and try not to micromanage. My boss is happy as long as there are no problems for him so I make sure that there aren't so he leaves me to get on with things.
I outsource as much as possible. Online grocery delivery which nanny puts away, cleaner does laundry and cleaning, nanny does DD stuff and runs errands. Amazon Prime for most birthday presents. Online shopping and direct delivery for new baby gifts etc. I'm lucky we can afford to do all of this but means that the time I do get with DD and I can focus on her and not be running around doing chores as much. Although the household management is largely still there.