Hi, my little girl is almost four months. She was 3.9kg when she was born, and she is definitely over 6kg now, not exactly sure what weight she is , we're going to the clinic at the end of the month. I don't think you need to worry about her weight yet, weight gain is good at her age, she'll run it off one day when she is bigger! My daughter also seems to be quite long.
We've already turned my daughter's car seat around too, it's been turned for a couple of weeks at least. She has good support of her head, and is more comfortable with the seat turned around. Our seat has a good recline on it, so we keep her in the reclined position, but forward facing, so she can look around and see what's happening....she's a real sticky beak!
Are you b/feeding or bottle? I am still b/feeding, which i am reasonably pleased about because I only managed to feed my first daughter for 3months, so I am doing well keeping up with my 2nd daughter.
And.....is your daughter sleeping through yet for you? Mine has her times when she will sleep an 8 hour stretch (she's done it maybe 4 times) but mostly she still wakes for a feed every 4 hours both day and night. Most of the time we struggle to get her to have naps longer than 1hour at a time during the day, but we're getting there!