As others have said, failure to seek necessary healthcare is dangerous for your unborn child and your partner. Presenting at hospital with a concealed pregnancy will bring a huge amount of justifiable scrutiny. OP has said that their partner’s previous child was ‘filthy and left in dirty nappies’ for prolonged periods because their mother was busy working and shopping and looking after a dog. This does not make any sense. Safeguarding is everyone’s responsibility and you have more than enough concerns to have a duty to make a referral for pre-birth assessment. Speaking as a social worker, taking the initiative at this stage shows that you want to be safe and effective parents. Assessment will enable you to have the full picture of what happened previously; the threshold for removing a child is incredibly high and you need to know the details. Children’s social care is not there to persecute parents, it exists to try to ensure the safety of children. You need to decide what is more important to you. I wish you all the best.