Hi,
I was in a similar situation to you where I wanted an uplift with implants and knew that another baby was on the cards at some point.
Anyway at my initial consultation my patient co-ordinator asked how my breasts changed in my 1st pregnancy, which they didn’t at all. She said this was a good sign as your body reacts the same in subsequent pregnancies, so I booked the surgery for Feb 2019. However, Christmas 2018 I found out I was pregnant and had to cancel and postpone my surgery. I am so grateful that I had my 2nd child before my surgery, because my co-ordinator was wrong and the 2nd pregnancy my breasts did change and got MASSIVE and then shrunk right back down after birth. So if I had, had the surgery prior to my children it could have led them to looking saggy again after the pregnancy. Also not sure if you plan to breast feed, but with an uplift they also move the nipple and sometimes reduce it and this can massively reduce your milk ducts so you may not be able to feed as well if at all after the surgery. My new surgery date is this september and in my opinion from my experience I would most definitely wait until you have finished having children, as you just can’t predict, and you don’t want to be disappointed if they were to sag again and you had already had the surgery. I hope that all makes sense and helps?! Xx