62cm is for newborn inserts for infant carriers, the newborn insert in this seat stays in much longer, often until over a year. OP at 2 months old, you definitely need all the inserts in.
It can be a bit tricky to use with the youngest babies. Try this.
One problem is that the pads on the straps are very bulky and can be caught inside the inserts. If you carefully unpopper them, you will find they are attached to velcro. Take them off and move them down about 1cm, so that they are not caught inside the insert. However please be aware that they are shoulder pads not chest pads, and must start on top of the child's shoulder, do not move too far down.
Secondly the hip straps can easily get caught in the sides of the insert. Check that everything is in place properly here, that they pass through the gaps provided and all runs smoothly.
Do a few test lengthen-and tighten- of the straps, done up with no child in the seat. Pull on the straps to lengthen, below the pads. Do not pull the pads. Check and remove any twists. If it does not run smoothly, contact Joie or your retailer for advice as you may have a fault.
The headrest likely needs to be on the lowest position. Make sure it's there and that the inserts are sitting correctly below it.
When you place the child in, start with the straps fully lengthened, open and laid over the sides. Line the child's shoulders up with the headrest and place them in centrally. Adjust position if necessary by scooping under their back/bum with your hands.
Now fasten the belt, even though it is very loose.
Now position the strap pads starting on the child's shoulder, going parallel and vertical down their chest (Not in a V shape over the shoulders). For a child of this age, you will need to manipulate their neck folds to get the straps close enough. Notice that the pads are "sticky" on the back - this is to help keep them in place, but also means that if you don't manually position them, they will get caught on the first bit of clothing they meet and get stuck in the wrong position (it's very annoying).
Pull the long strap to tighten the 5 point harness. Tug up on the crotch pad, then slip your finger under the harness just above the buckle and pull upwards to bring in any slack from the hip straps, reposition the shoulder pads if necessary, and tighten again. You are aiming to get all visible slack out of the straps.
Attached photo is how your child should look.
As your child grows:
Move the headrest up if your child's shoulders no longer fit underneath it. You can move the attached head support up one setting by adjusting which popper attaches it to the body support.
Remove the head support when the child's head no longer fits within it. (Usually 3-6 months)
Remove the body support when the child's arms start getting pushed out at the sides (usually about 8-9 months)
Keep the big thick wedge insert in until child weighs 9kg, can sit up, is at least 6 months old, and no longer needs the body insert. If they have a big gap at the tummy or their head flops while sleeping, you should put it back in. You can leave it in until approx 13kg (about 2 years).
When you remove the wedge insert you will normally need to drop down the headrest a notch or two.
No inserts may be used forward facing.
