Around the age of 4 months. Once the infant has head control, everything else falls into place.
no it
14 and up
at about six months and sit up with out falling i would say seven..
No, they cannot walk, or sit up by themselves.
There are many 3 month old babies that can sit with support. You do need to make sure the baby can hold their head up.
most likely sit up and mumble and roll over
If the baby bird is alive, she doesn't sit on it at all! She sits near it and snuggles up to it. She sits on the eggs until they hatch, which is different depending on the type of bird.
1 month, if your baby is healthy.. If not a healthy baby than possibly up to 6 months. Watch your child's diet
most likely sit up and mumble and roll over
The cast of Bringing up Baby - 1994 includes: Benjamin Spock as Himself - interviewee
Some babies sit up by 6 months. Apparently, however, not sitting up by 9 months isn't a big deal either. See the Related Link to a video regarding a baby's milestones - sitting included.
Pram (if the baby lies down) or Pushchair (if the baby sits up). The sit-up type / recliner is VERY commonly refered to as a 'buggy' too ... as in 'baby buggy'!