Option 4). 4.5 kg
Step-by-step explanation:
The given options for the weight of a baby are
1) 5000 mg = 5000/1000 gms = 5 gms = .005 kg
2) 1400 g = 1.5 kg
3) 350 mg = 0.35 gms =
4) 4.5 kg
Out of these options option 4 is the most suitable weight that describes the weight of a baby.