If they are young, spanking is not inappropriate for deliberate disobedience. But always remembering that spanking is done calmly, and with love. No beating allowed!
Couple this with love, reading the Word of God, praying with them, and playing with them, and you have set boundaries and limits, which will internalize and be with them the rest of their lives! It is just wrong not to set boundaries for children, even as young as 10 months! They will never learn to obey God, or the rules of life or the laws of the land, if they have not internalized the boundaries they received as a young child growing up!