Would you diagnose me with IGT/hypoplasia and will an explant possibly help milk production with future children? (Photo)

A property executed breast implant surgery should have no impact on breast feeding as the ducts should not be disturbed.
When placed through an inframmary incision, the implant never really touches the breast tissue; it slides underneath it, so this approach has the least impact on the gland itself. Removing the implants and the capsules through the inframmary incision should not cause issues with breastfeeding.
You may find with subsequent babies, that your milk supply improves. This is because more glandular tissue is made with each pregnancy/breastfeeding experience. Best to consult with your OB/GYN regarding IGT or a local breast feeding support group to talk with other mothers experiencing the same concerns.

Good morning!
You have such little breast tissue that I doubt an explant will alter your ability to breastfeed, but on the other hand your implants are small so removing them should restore your breasts to their normal shape without sagging!

Dear Selfconscious2020,
generally spekaing, breast implants don't affect glandular tissue so it is unlikely to expect that removal of breast implants will increase lactation. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

I'm sorry that you've had issues with breastfeeding. Typically women are able to successfully breastfeed with implants in place. It may be the implants are not impacting the situation. If you elect to remove them, you may have some loose skin, but it should not be significant since your implants are conservatively sized.

Implants may be having no effect on your ability to produce milk, so removing them may make no change. Some women just cannot breast feed well or even at all. Also, every pregnancy is different, and you may find breast feeding is easier or harder the second time. You are not that larger, so removing them would not leave a lot of excess skin, but you will have some.