It’s absolutely normal. They start to realize that you are a separate person and have the ability to leave. They do not understand yet that you’ll come back. It’s hard but it’ll get better. During the next years there will always be periods of them going through a phase of separation anxiety, especially when they develop independence Having other people around didn’t do much for my kids. The best thing for you to do is make him understand that you’ll are coming back. Meaning do not let him cry (or course you can go to the bathroom by yourself, and at times we aren’t able to attend right away). It’s about building trust. Keep in mind, you’re the safe space he knows
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Your baby has discovered object permanence! Great developmental milestone and totally normal for clinginess to settle in around 6-9 months. It usually peaks 12-18 months. You are the caretaker and it is their survival skill. They should eventually grow out of it by 18 months to 2 years, depending on the baby.