A 4.5 kg weighted blanket can be suitable for some individuals, but the ideal weight of a weighted blanket depends on factors such as body weight, size, and personal preference. As a general guideline, the weight of the blanket should be around 10% of the individual's body weight. For example, a 4.5 kg weighted blanket would be appropriate for someone who weighs around 45 kg. However, if the person weighs significantly less or more, the weight may need to be adjusted accordingly. It's important to ensure that the blanket provides enough pressure to feel calming and comforting without feeling too heavy or restrictive. It's worth noting that some people may prefer a slightly lighter or heavier weighted blanket based on their personal comfort and sensory needs. It's recommended to try different weights and consult with the manufacturer or a healthcare professional to determine the most suitable weight for you.