Is it normal for young boys to have a penis a little bit inclined downward (i am not saying like curved) to some degree in standing position or it shows some weakness? i mean if penis almost straight but a little bit inclined with base.

Gravity pulls: A young boy (such as at age 5 years) in a upright position will have a flaccid penis in the downward position due to the Earth's gravity, unless there is something working against gravity (such water in the swimming pool, etc...). His erect penis may point slightly downward, straight ahead, or a bit upward, but in a young boy we don't worry about his erections unless the tip looks curved downward.