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You will need to seek a child arrangements order from the family court if you cannot agree about who will have care of your son.
Such an order can set out who looks after the child and when. Such an order once made can be enforced if it is breached. In order to do this, you will need to arrange for and attend a mediation appointment with your ex first to see if an order can be agreed. Even if you and your ex end up having to go to court to sort out the differences, you will normally need to prove that you’ve been to a mediation information and assessment meeting (MIAM). This is an introductory meeting to explain what mediation is and how it might help you. If your ex doesn't want to see a mediator, you should go to the MIAM on your own. You’ll then be able to prove you’ve tried mediation if you later want to go court. You can’t force your ex to go to mediation. In order to find a mediator you can use this link on the Family Mediation Council website here: https://www.familymediationcouncil.org.uk/find-local-mediator/
You’ll normally have to pay about £30 for an MIAM, although sometimes this first meeting is free. Follow-up sessions usually cost you and your ex about £80 each - most people need to go to 3 or 4.
The cost of mediation varies depending on where you live. Phone around to find the best price, but bear in mind the cheapest might not be the best.
If the MIAM does not work and you not able to agree to mediation you will need to go to court. This will require you to fill out form C100 which can be found here: https://www.gov.uk/government/publications/form-c100-application-under-the-children-act-1989-for-a-child-arrangements-prohibited-steps-specific-issue-section-8-order-or-to-vary-or-discharge
You can find guidance on filling out the application here: https://www.gov.uk/government/publications/family-court-applications-that-involve-children-cb1
Send the original form and 3 copies of it to the nearest court that deals with children, you can find your nearest court here: https://courttribunalfinder.service.gov.uk/search/
The application will cost £215. I hope this helps, if you can please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.