Hi, A.
Thanks for sharing your issue with your girlfriend, I think we have all exprienced something lie this! & it comes from insecurity about something. Perhaps her marriage! If she has 2 under 3, she hs her hands full, & now she's begun comparing hubbies!
I immediatly thought of a workshop I once took in 'Hakomi,' which can be used as a counseling technique, or along with bodywork (I'm a massage therapist & grandma). You basically mirror back what they're saying, get them to express their concerns, then, while validating the concern, re-state your position.
The teacher gave an example of something that happened with her mom for YEARS - everytime she was on the phone, her mom would ask 'are you wearing a bra?' (!!!) She was small, & usually didn't - if she told the truth, her mom nagged, if she fibbed, her mom pressed her for the truth, . . .
One day, after she'd taken Hakomi, she decided to give that a try.
Mom: "are you wearing a bra?" . . .
Teacher: "It really bothers you when I don't wear a bra, doesn't it?"
M: - (a bit confused & surprised) 'Well, yes it does!'
T: "You think of Aunt Madge, & how saggy her breasts got, don't you"
M: 'Well, yes, now that you mention it, it does!! I'm afraid you will look like she did!'
T: "That really concerns you, doesn't it?"
M: 'Well, of course it does!!' (a few more rounds of 'understanding,' then:)
T: "You know, it used to concern me, too; then I realized I was only a 32A, & that probably wasn't going to be a problem for me! So unless I'm going out, I find a plain undershirt works just fine for me! But I understand where you're coming from!"
M: 'Well, it does worry me!'
T: "I know it does! I appreciate your concern, thanks for always having my best interest at heart! (& on to something else)
Next call - NO MENTION OF THE BRA!! Her mom never mentioned it again!
With the friend, it might go something like this:
Friend bragging . . .
A.: "Isn't it exciting to watch them grow?"
Friend (tries to engage in comparison)
A: "You know, when (eldest) was little, I worried about whether (he/she) was keeping up with the kids around (him/her)! S/he did a lot of things early, & I was so proud - it's fun to see the different personalities, & to realize that each child does some things early, & takes awhile with others. Do you sometimes worry about . . .'s progress?"
Friend: 'well, ... is really advanced!!'
A: "It's fun to watch, isn't it! I love it when they learn new things - (& get her engaged in telling about the newest thing the BABY has done - If you have an idea where her insecurity lies, gently see if she's ready to talk about it. & affirm that you understand her concerns about her children's development, )
& check in with yourself - if you find yourself dreading your 'friend's' visits, look for other friends!! - library story time, kids yours play well with at school or in the park, . . .
My dau is in a Mom's group that has met since her older daugher (8)'s first summer - the core group had been in childbirth classes together. Now, most have at least 2, some 3 kids. The oldest group is in second grade in a duel-emersion Spanish/English classroom. (only one has half Hispanic children - they all want their kids to be bi-lingual)
Most work outside the home, they meet weekly for a play date, & have a monthly 'mom's nite out.' Last summer they did an overnight trip to the beach (I had a room close by with her two girls, then 7 & 2)
It's been great for her.
A few people have invited a friend to join Moms - occ someone they wish they hadn't! (one 'fired' herself when she got mad at something that happened - everyone was relieved). So do check in with yourself on how you feel about this friendship? "Anything that's not an energy source is an energy drain." (of course we all have down days/times, but if this has been going on for awhile, consider getting out!)
I can't imagine the schedule you must have had working on your master's & with three kids!! Congradulations on your degree - & good luck with job, childcare, & time for you!