Hi, I don't know about the slings - tended to think that mum and baby both get a bit hot - especially with this weather (although it may be short lived!!). I have a 21 month gap between the two and my second is 4 months old now. I would recommend getting a bebe au lait breastfeeding cover. You can wear what u like, chuck it on in seconds and feed. It's big enough that you can feel secure holding baby with one arm and playing with toddler. Admittedly it doesn't give u two hands free but speed is a bonus. I think second babies learn to eat fast....or starve when there is a toddler around ;)!!!!