losing my mind?

I recently became a mother of two. my first son is 18 months and my second is three weeks old. they’re both absolutely angels but i’m not sure how to do this, still. i feel like i’m losing my shit on the daily. i never show it around them, or at least i try not to. but between sleep deprivation, teething, and breastfeeding it’s hard. i feel like i’m not giving either of them a fair amount of time. i hardly hold my newborn so i can play with my toddler. and then when i finally do sit down to cuddle my newborn, my toddler gets sad most of the time and then i just want to cry. i can’t take them outside because i don’t drive, and we live in an apartment complex on a hill with nothing around us. anybody have any tips? especially moms who have experienced the two under two thing? pics of the culprits.