My son is 3 months 20 days old. He has given 3dose of pentavalent vaccine on scheduled time. I missed his 1st dose of ipv before so He got 1st dose of IPV (0.1 ml subcutaneous) with 3rd dose of pentavalent vaccine. So when should I give 2nd dose of IPV? How many doses are needed? His weight is 6.6 kg now. Which other vaccines are mandatory?

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