6 months old not interested in holding her own bottle

Hi everyone. I think my tittle says it all. Shes 6 months now and doesnt show interest in holding her own milk bottle. I started practicing with her to hold it since she was 4 months but up till now she doesnt want to hold it long. Is it something i should be concern of? She can hold it with both hands tho just not long enough and will let go of it after like 10 secs