My youngest Lo went FF when she was just over 6 months but she weighed over the reccomended weight and her head was nearly above the seat, she has always been very big for her age. Im pretty sure my eldest daughter was 9 months as she was smaller in weight.
There is nothing wrong with FF as long as you follow the guidelines.
does you LO cry all the time in the car? there is a thing called 'motion sickness' (i get this)
(copied and paste from some info i found for you)
If you've ever been sick to your stomach while riding in a car, train, airplane, or boat, you know exactly what motion sickness feels like. It's no fun.
To understand motion sickness, it helps to understand a few parts of your body and how they affect the way you feel movement:
•Inner ears: Liquid in the semicircular canals of the inner ear allows you to sense if you're moving, and, if you are, which way you're moving — up, down, side to side, round and round, forward, or backward.
•Eyes: What you see also lets your body know whether you're moving and in which direction.
•Skin receptors: These receptors tell your brain which parts of your body are touching the ground.
•Muscles and joint sensory receptors: These sensing receptors tell your brain if you're moving your muscles and which position your body is in.
The brain gets an instant report from these different parts of your body and tries to put together a total picture about what you are doing just at that moment. But if any of the pieces of this picture don't match, you can get motion sickness.
For example, if you're riding in a car and reading a book, your inner ears and skin receptors will detect that you are moving forward. However, your eyes are looking at a book that isn't moving, and your muscle receptors are telling your brain that you're sitting still. So the brain gets a little confused. Things may begin to feel a little scrambled inside your head at that point.
When this happens, you might feel really tired, dizzy, or sick to your stomach. Sometimes you might even throw up. And if you're feeling scared or anxious, your motion sickness might get even worse.
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ListenAvoiding Motion SicknessTo avoid motion sickness:
Put your best face forward. Always sit facing forward. Don't face backward in your seat or sit in a seat that faces backward. Sitting forward helps keep the motion sensed by your eyes and ears the same.
like i said i get this and have done since a child and it isnt pleasent, cant read in a moving vehicle and cant sit facing the wrong direction in any vehicle..... i'm not saying your LO has this but if your LO is upset all the time they are in a car it COULD be a reason.