Vitamin D doesn't come through windows because they're designed to block out UV light. She's probably getting enough right now just going to the car and back but you can also supplement yourself with 5000 units and she will get it through your breastmilk. Also remember when you're trying to get it from the sun that it takes 48 hours to fully absorb AND it washes off with soap.
|| wife to my best friend for 16 years, mom to Miles
and our 3 furbabies (2 dogs & a cat). TTC#2! Loving life in beautiful Los Angeles.