LO is about to be transitioned to her convertible car seats because of how heavy she is in the infant one. I already transitioned her at day care and her day care mama says LO loves it! She sits up higher and hasn't fussed at all whereas before she fussed when daycare mama put her in the car.

LO can't hold herself up all the way yet, so what am I supposed to do when I take her to the store? She's only 5 months old. Where do I put her in the cart/how do I stabilize her? Currently she just chills in her car seat, but that won't be an option when she's in the convertible seats.