A shortage of baby formula appears to be worsening as parents scramble to find specific brands.Several of the different companies that make baby formula are all reporting shortages. Inflation, supply chain shortages and product recalls are to blame for the shortage.| RELATED: Empty baby formula shelves have families scramblingSinai Hospital pediatrician Dr. Dana Silver said her office is fielding many calls."Just yesterday, I had a parent call me very desperate. His daughter is fed through a G-tube and could not find her specialty formula anywhere and had completely run out," Silver said.So, Silver contacted the company and the formula is on the way.| RELATED: The baby formula supply problem is getting worse. Here's whyWBAL-TV 11 News found baby formula scarce in several stores across Baltimore. Some stores are implementing quantity limits as supply remains low.In response to an 11 News inquiry, Walgreens said in a statement: "Due to increased demand and various supplier challenges, infant and toddler formulas are seeing constraint across the country. Similar to other retailers, we put into effect purchase limits of three per transaction on all infant and toddler formula to help improve inventory. We continue to work diligently with our supplier partners to best meet customer demands."A Target representative told 11 News: "Target has limited baby formula purchases to four units per customer for online purchases. There is no limit on the number of units that can be bought in person in Target stores."| RELATED: Baby formula shortage causing problems for parentsIn the meantime, Silver said it's OK for some parents to switch to a generic brand."If they are on a cow's milk-based formula, they can change to another brand. I always say it's like Coke and Pepsi. It's OK to switch. If they are on a specialty formula, they really need to check with their pediatrician," Silver said.| RELATED: FDA is 'working around the clock' to address baby formula shortage, Psaki saysThe same goes for soy-based and sensitive brands. But Silver warned parents not to thin out their remaining supply of formula."What I really want to encourage is they don't thin out the formula, don't add extra water that can lead to very serious complications with their babies," Silver said.| RELATED: FDA details problems at plant behind recalled baby formulaSilver said parents can buy formulas online, but they should be careful."They want to make sure they are not buying formulas that are from other countries because they have different standards," Silver said.Parents who are looking to try a new formula might reach out to a friend who has formula to spare and try theirs or ask a pediatrician for samples.