When did you remove the car seat adapter and just let your LO sit in the stroller? I have a Citi Mini GT with an adapter for our Chicco car seat. LO is 5.5 months and about 14 pounds. Not sitting up yet, but has good head control in her jumper. It's so damn hot in Texas right now, I don't want her to be in the car seat anymore than she has to be - that thing is warm.