Tummy Soft Drops, which contain probiotics such as Bacillus coagulans and digestive enzymes like alpha amylase, papain, and lactase, are generally safe to administer to babies on the day of vaccination. These ingredients support digestion and do not interfere with the effectiveness of vaccines. However, it's a good idea to give the drops at a different time than the vaccination, such as earlier in the day or later in the evening, so you can clearly observe any reactions from the vaccine itself. If your baby feels unwell after the vaccination, such as experiencing a fever, vomiting, or poor feeding, it's okay to skip one dose and resume once your baby feels better. Always follow your paediatrician's advice and the recommended dosage.