What would be a suitable treatment of fine lines for a breastfeeding mama in her 30's?

Halo is a great way to address fine lines under the eyes since it can regenerate collagen and elastin. Platelet-rich plasma injections and with micro needling is another safe and effective option in this area. Keracell MD makes a great eye lift and contour cream and hydrating mist that can help reduce the appearance of fine lines. Drinking 2.5 liters of water a day will also help address the other critical dimension of fine lines under the eyes, dehydration.   

Halo, vivace (rf microneedling), regular microneedling or all of the above plus PRP would be fine options. Breastfeeding is not a contraindication for laser or energy based devices. Actual pregnancy would be a concern for lasers but at this point, you are in great shape. I look at halo and vivace in similar ways. I think a single halo is a better treatment than one vivace, but a series of vivace is fairly equivalent. Benefits to vivace are that there’s no downtime whereas halo has a few days.