My 7 months baby fell from the bed yesterday on her back. I couldn't notice how she fell but we heard a sound and we ran to her only to find here lying on her back crying. The height of the bed is about 50 inch from the floor. She seems to be OK now playing but still I am very scared whether she might have internal injury. How to know whether she had any injury at home ?
Firstly, if you're really worried for any reason or even have a shadow of a doubt take her to a doctor.
Generally babies and toddlers aren't injured in falls as they have softer bones and don't tend to tense up while falling until they've experienced the pain of a few falls. Unless your baby is showing pain or a side effect from the fall such a losing consciousness, it's unlikely you have anything to worry about.
I have five children and you tend to become more relaxed and less worried unless you can see something is wrong or unusual (such as refusing food for more than 2 normal feeds) with the baby after a fall or bump. Babies and toddlers are extremely resilient.
Here is a good page about falls including warning signs to look out for: http://www.babycenter.com/0_falls_397.bc
Call 911 if your child experiences any of the following after a fall:
Take your child to the emergency room or talk to his doctor immediately if you notice any of the following:
Usually babies as more resistant to all kind of injuries as their bones are more flexible and less fragile than the adult ones. Also they regenerate faster as they are still developing and have a really young tissues.
But it's still better to go to doctor. You'll lose couple of hours but will be sure that everything is fine
We've had two children who experienced broken bones from falling before the age of 18 months.
The first was with a 7 month old, about a 24 inch fall from a bed. Symptoms were that the baby refused to place any weight on, or use one of his feet, and gentle foot manipulation caused the baby obvious distress (crying, clinging, stop paying attention to what he was doing at the time). XRays showed a small fracture in the end of the tibia (calf bone, end closest to the ankle) which didn't require a cast. This was a significant adventure because it was initially thought that the fracture went through the growth plate, which can be very serious in children.
The second was with a 14 month old at the climbing stage, with a 18 inch fall while trying to climb a chair. Symptoms were largely the same, but with the arm. This resulted in fractures of the ulna and radius (both bones in the forearm). As others have mentioned, due to the spongy/soft nature of bones at these ages the fractures were compression fractures, rather than breaks. A cast was used for a few weeks not because the breaks required it, but because it was expected that the child wouldn't be able to understand not to use that arm until it healed, and indeed he was again climbing on things with the cast and a sling in place, the next day.
A 50 inch fall is a significant drop, even onto a carpeted, padded floor. Note that both of the above fractures occurred with a less than 2 foot drop onto padded carpet. I would strongly suggest that regardless of the symptoms you take your child in to be examined. Some types of injuries aren't apparent without careful examination.
However if your child has changed in behavior - additional sleep, eating habits change, crying more (or less) frequently, avoiding activities she used to enjoy, or increased clinginess, go see the doctor regardless of the height of the fall.