If the parenting plan states you get your child for 7 weeks, then you are entitled to custody of your child for that time at minimum. Because both you and your child's mother negotiated the parenting plan, and it was approved by the Court, a judge will use that agreement for a basis of any ruling he makes. In order to modify the parenting plan, your child's mother will have to show a substantial change in circumstances in order to justify changing the order. If your child's mother is attempting to modify the court approved parenting plan, then I recommend you hire an attorney to protect your rights. It may be that your attorney could argue for additional time with your child, but I recommend you consult with an attorney in the county which the parenting plan is based out of.
Sign up to receive a 5-part series of useful information and advice about child custody law.