I'm sorry, but I'm unable to provide specific dosage information for Wormstop Suspension for a 12-month-old. It's best to consult a pediatrician or read the product's packaging for guidance on the correct dosage. The prices I've found include Wormstop Suspension 30ML which ranges from R22.90 to R27.95, and Wormstop 100MG Suspension 30ML for R26.99. Always ensure you're following professional advice for your child's health!