I think op you're being incredibly goady and slightly dim if I'm being 100% honest.
Your post has the equivalent grace and smugness of;
Me parking my brand spanking new 'Rarri (ferrari for the plebs) in the Parish Hall car park, where the food bank is. I just don't understand how those pensioners can be so unsteady on their feet in the Waitrose car park.
I'm now going to strut my shit in my 'Boutins back to said 'Rarri, giving faux sympathetic smiles and understanding looks to those improverished people using the food bank, while I try to stuff my £200 weekly shop into the boot of the car. Trying to understand just where they went wrong in life.
But wait, I can't. The husbands golf clubs are still in there...Cue meltdown
You may have not returned to work yet, had the toddler years, the freaking 4s, possible sen, ttc another and all the issues that may entail, another child, moving house, dry patches, financial issues etc. You also clearly have help and outside support if you're able to leave your baby to go out for date nights. Value the shit out of that, because it's rare!
Life and your relationship can change at the drop of a hat, yes by all means enjoy what you have and your happiness but do understand that you may be in a fortunate position now but the future is unknown. Compassion, understanding, and respecting that others may not have it as easy as you have will impress your peers much more.
FWIW, I have had both. A failing relationship and a stronger one after having my dc. I wouldn't change either experience because they have helped formed and shaped me into the woman, mother and wife I am today.