I think this sums it up. I think empathy is OK, but not chiming in with views and opinions on something you have no experience with.
I had a friend about 30 years ago (who I'd known about 7-8 years at the time, I met her through a hobby group,) who was childfree, but not by choice, she just 'hadn't met the right man.' I had my first child, and she came to see me in hospital the day after, (yes, that soon!) She also came to see me as soon as I had got home a week later.
She then came 3 times a week. Every single time she came, she started lecturing me on how I should be looking after my baby. Advice about breastfeeding, telling me I wasn't doing it right when I did it while she was there, telling me my baby's nappy needs changing as it's 'full.' (It wasn't) Telling me what time she should be going to bed, what time she needs to be put down for a nap, and all sorts of 'advice.' Acting like she was a midwife or social worker or something! (She worked in a bank!) When my baby was just under 5 weeks old, she said she wants to babysit her, and DH and I can go out. She said to my DD 'we'll show mummy how to look after a baby properly.' 
I felt my cheeks flushing red, I was fucking fuming. I said 'mummy has only had a baby for 33 days, mummy is learning as she's going along...'
She said 'awwww, don't get all salty, I just know a lot about looking after babies and small children, I have 2 nieces and a nephew with only 7 years between them, that I baby sit sometimes. Anyway have a word with Dave and let me know which date you want to go out next week, and I'll be here....'
tl;dr I told DH all this and he went mad. Firstly that she had upset me, and secondly that she thought she knew more because she babysits her nieces and nephews sometimes. It's not QUITE the same as having your own babies, and being woken all through the night, and breastfeeding them, and having them hang off you half the day, with 3 hours sleep a night! Along with postnatal depression for many months, for many new mothers.
I didn't have her babysitting, and when she phoned again, I got DH to put her off and kept putting her off again and again, until she got the message 'leave me alone.'
I didn't have babies til around 30 years old, and I don't ever recall - when I was childfree - lecturing mothers of babies/young children on how to look after them properly, and I used to babysit my little brother AND my neighbours kids!!!
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