All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
First of all, we would like to congratulate you on the blessing of embracing Islam, and we ask Allaah to bless your parents with guidance and open their hearts up to Islam, and this is not difficult for Allaah. We advise you to supplicate Allaah for them, to be keen on being dutiful and kind towards them, and to demonstrate the merits and virtues of Islam in your conduct and interactions with them.
If your husband does not fear harm for you and your child when you visit them, then you should try to convince him in a kind manner to allow you to visit them more than you do now, provided that this does not cause you to neglect the fulfilment of the rights of your husband or child.
However, if he fears that such visits would incur harm on you and your child, then a good husband is the one who is keen on protecting his family. He is commended for that, not dispraised. The husband is ordered to protect the religiosity of his wife and children and guard them against Fitnah (trials of faith). Allaah, The Exalted, says (what means): {O you who have believed, protect yourselves and your families from a Fire whose fuel is people and stones, over which are [appointed] angels, harsh and severe; they do not disobey Allaah in what He commands them but do what they are commanded.} [Quran 66:6]
Still, you can call your parents frequently and ask how they are doing, send them gifts, and the like of what constitutes maintaining the ties of kinship according to common practice.
Finally, we hope that you can reach a mutual understanding and establish mutual respect, as this would be in your best interest. Beware of letting the devil take advantage of your disagreement to ruin your marriage. If dispute and divorce take place, the first one harmed is the child.
Allaah Knows best.